| Catholic Engagements with the Modern World, 1487-1918 | ||||
| Title | Author | Year Published | Language | General Subject |
| 50 Thesen Zu Den Kirchlichen Fragen Der Gegenwart Als Positive Gegenantwort Auf Die Päpstliche Einladung Zum Concil | 1869 | German | Catholic Church | |
| A Bird's Eye View of the Doctrinal Teaching of the Roman Catholic Church and the True Secret to Ireland's Independence: Under the Similitude of a Commonplace Talk With Irish Roman Catholics | Daly, John; converted Roman Catholic. | 1883 | English | Catholic Church |
| A Bishop and His Flock | 1903 | English | Catholic Church | |
| A Brief Historical Sketch of the Catholic Church on Long Island | Mulrenan, Patrick. | 1871 | English | Catholics |
| A Brief Sketch of the Early History of the Catholic Church on the Island of New York | Bayley, James Roosevelt; 1814-1877. | 1870 | English | Catholics |
| A Candid Examination of the Question Whether the Pope of Rome Is the Great Antichrist of Scripture | Hopkins, John Henry; 1792-1868. | 1868 | English | Papacy |
| A Candid History of the Jesuits | McCabe, Joseph; 1867-1955. | 1913 | English | Jesuits |
| A Catechism of Christian Doctrine | 1911 | Maltese | Catholic Church | |
| A Catholic Catechism for the Parochial and Sunday Schools of the United States | Grònings, Jakob; 1833-1911. | 1900 | English | Catholic Church |
| A Catholic Christian Church the Want of Our Time | Tayler, John James; 1797-1869. | 1867 | English | Christian union |
| A Catholic History of Alabama and the Floridas | Carroll, Austin; 1835-1909. | 1908 | English | Catholic Church |
| A Challenge to Cardinal Wiseman, or, Lectures by the Rev. John Cumming, D.D., Minister of the Scottish National Church, Covent Garden, London, and the Rev. R.J. M'ghee, A.M. Rector of Holywell, Hunts. at the Great Meetings Held in Exeter Hall to Which Car | Cumming, John; 1807-1881. | 1854 | English | Catholic Church |
| A Chinese St. Francis, or, The Life of Brother Mao | Brown, C. Campbell; (Colin Campbell) | 1911 | English | Cheng, Mao |
| A Collection of Papers Connected With the Theological Movement of 1833 | 1843 | English | Oxford movement | |
| A Commentary by Writers of the First Five Centuries on the Place of St. Peter in the New Testament: And That of St. Peter's Successors in the Church | 1871 | English | Popes | |
| A Compendium of the History of the Catholic Church: From the Commencement of the Christian Era to the Ecumenical Council of the Vatican: In Which Are Narrated Her Combats, and Her Victories in Times of Persecution, Heresy, and Scandal, and… | 1882 | English | Church history | |
| A Debate on the Roman Catholic Religion: Held in the Sycamore-street Meeting House, Cincinnati, From the 13th to the 21st of January, 1837 | Campbell, Alexander; 1788-1866. | 1855 | English | Religious disputations |
| A Dictionary of Christian Antiquities: Being a Continuation of the "Dictionary of the Bible" | 1875 | English | Christian antiquities | |
| A Formulary of the Papal Penitentiary in the Thirteenth Century | 1892 | Latin | Repentance | |
| A Free Catholic Church | Thomas, J. M. Lloyd; (Joseph Morgan Lloyd); b. 1868. | 1907 | English | Modernism |
| A General History of the Catholic Church: From the Commencement of the Christian Era Until the Present Time | Darras, J. E. (Joseph Epiphane); 1825-1878. | 1868 | English | Church history |
| A Handbook of the Romish Controversy: Being a Refutation in Detail of the Creed of Pope Pius the Fourth, on the Grounds of Scripture and Reason | Stanford, Charles Stuart. | 1852 | English | Catholic Church |
| A History of Auricular Confession and Indulgences in the Latin Church | Lea, Henry Charles; 1825-1909. | 1896 | English | Confession |
| A History of Catholicity in Northern Ohio and in the Diocese of Cleveland: From 1749 to December 31, 1900 | Houck, George F. (George Francis); 1847-1916. | 1903 | English | Catholic Church |
| A History of Catholicity in Northern Ohio and the Diocese of Cleveland. Volume 2; Biographical | Carr, Michael W. 1851-1922. | 1903 | English | Catholics |
| A History of the Catholic Church in the Dioceses of Pittsburg and Allegheny: From Its Establishment to the Present Time | Lambing, Andrew Arnold; 1842-1918. | 1880 | English | Catholic Church |
| A History of the Catholic Church, or, Christ in His Church | Businger, L. C. (Lucas Caspar); 1832-1910. | 1881 | English | Catholic Church |
| A History of the Commandments of the Church | Villien, A. (Antoine); 1867-1943. | 1915 | English | Commandments of the church |
| A History of the Council of Trent | Buckley, Theodore Alois; 1825-1856. | 1852 | English | Council of Trent |
| A History of the Doctrine of the Holy Eucharist | Stone, Darwell; 1859-1941. | 1909 | English | Lord's Supper |
| A History of the Holy Eucharist in Great Britain | Bridgett, T. E. | 1908 | English | Lord's Supper |
| A History of the Inquisition of Spain | Lea, Henry Charles; 1825-1909. | 1906 | English | Inquisition |
| A History of the Papacy: From the Great Schism to the Sack of Rome | Creighton, M. (Mandell); 1843-1901. | 1897 | English | Papacy |
| A History of the Roman Catholic Church in the United States | O'Gorman, Thomas. | 1895 | English | Catholic Church |
| A History of the So-Called Jansenist Church of Holland: With a Sketch of Its Earlier Annals, and Some Account of the Brothers of the Common Life | Neale, J. M. (John Mason); 1818-1866. | 1858 | English | Jansenists |
| A Life of Pius IX | O'Reilly, Bernard; 1823-1907. | 1878 | English | Popes |
| A Life of the Pope (Leo the Thirteenth) | Hall, A. D. (Arthur D.) | 1899 | English | Popes |
| A Life's Decision | Allies, T. W. (Thomas William); 1813-1903. | 1894 | English | Catholic converts |
| A Manual for Confessors: Being a Guide to the Administration of the Sacrament of Penance for the Use of Priests of the English Church | Belton, Francis George. | 1916 | English | Penance |
| A Manual of Catholic Theology: Based on Scheeben's Dogmatik | Scheeben, Matthias Joseph; 1835-1888. | 1899 | English | Theology, Doctrinal |
| A Manual of Councils of the Holy Catholic Church | Landon, Edward H. (Edward Henry); d. 1877. | 1893 | English | Councils and synods |
| A Manual of the Catholic Religion for Catechists, Teachers and Self-Instruction | Weninger, F. X. (Francis Xavier); 1805-1888. | 1861 | English | Catholic Church |
| A Manual of the Ceremonies Used in the Catholic Church: Faithfully Translated by Order of the First Council, Held in Baltimore, in 1829, for the Use of Churches in the United States of America. | 1833 | English | Catholic Church | |
| A Manual of Theology for the Laity: Being a Brief, Clear, and Systematic Exposition of the Reason and Authority of Religion and a Practical Guide Book for All of Good Will | Geiermann, P. | 1906 | English | Catholic Church |
| A Memoir of Baron Bunsen: Late Minister Plenipotentiary and Envoy Extraordinary of His Majesty Frederic William IV. at the Court of St. James | Bunsen, Frances; Freifrau von; 1791-1876. | 1868 | English | Bunsen, Christian Karl Josias |
| A Modern Pilgrim's Progress | 1906 | English | Catholic converts | |
| A Much-Abused Letter | Tyrrell, George; 1861-1909. | 1906 | English | Modernism |
| A Narrative of Events Connected With the Publication of the Tracts for the Times: With an Introduction and Supplement Extending to the Present Time | Palmer, William; 1803-1885. | 1883 | English | Oxford movement |
| A New History of the Conquest of Mexico: In Which Las Casas' Denunciations of the Popular Historians of That War Are Fully Vindicated | Wilson, Robert Anderson; 1812-1872. | 1859 | English | Mexico |
| A Polemical Treatise on the Immaculate Conception of the Blessed Virgin | Lambruschini, Luigi; 1776-1854. | 1855 | English | Immaculate Conception |
| A Popular Life of Our Holy Father Pope Pius the Ninth | Brennan, Richard; 1833?-1893. | 1877 | English | Popes |
| A Preservative Against Popery in Several Select Discourses Upon the Principal Heads of Controversy Between Protestants and Papists: Being Written and Published by the Most Eminent Divines of the Church of England, Chiefly in Reign of King Jam | 1848 | English | Catholic Church | |
| A Primer of Roman Catholicism, or, The Doctrines of the Church of Rome Briefly Examined in the Light of Scripture | Wright, Charles H. H. (Charles Henry Hamilton); 1836-1909. | 1896 | English | Catholic Church |
| A Relation of the Conference Between William Laud, Late Lord Archbishop of Canterbury and Mr. Fisher the Jesuit by the Command of King James of Ever Blessed Memory: With an Answer to Such Exceptions as A.C. Takes Against It | Laud, William; 1573-1645. | 1901 | English | Church of England |
| A Reported Change in Religion | Holland, Bernard Henry; 1856-1926. | 1899 | English | Disputations, Religious |
| A Seasonable Caveat Against Popery | Penn, William; 1644-1718. | 1852 | English | Catholic Church |
| A Selected Bibliography of the Religious Denominations of the United States | Bowerman, George Franklin; 1868-1960. | 1896 | English | Christianity |
| A Short History of the Council of Trent | Littledale, Richard Frederick; 1833-1890. | 1888 | English | Council of Trent |
| A Short History of the Oxford Movement | Ollard, S. L. (Sidney Leslie); 1875-1949. | 1915 | English | Oxford movement |
| A Sketch of the Rise and Progress of the Catholic Church in Ceylon | 1848 | English | Catholic Church | |
| A Sure Way to Find Out the True Religion: In a Conversation Between a Father and His Son | Baddeley, T. (Thomas) | 1884 | English | Catholic Church |
| A Systematic Study of the Catholic Religion | Coppens, Charles; 1835-1920. | 1903 | English | Catholic Church |
| A Text Book of Popery: Comprising a Brief History of the Council of Trent, a Translation of Its Doctrinal Decrees, and Copious Extracts From the Catechism Published by Its Authority: With Notes and Illustrations: To Which Is Added, in an... | Cramp, J. M. (John Mockett); 1796-1881. | 1831 | English | Catholic Church |
| A Treatise on the Bull Apostolicae Curae | 1896 | English | Anglican orders | |
| A Vindication of Italy and the Papal States: (From the Dublin Review for October, 1856): An Able Vindication of Catholic Italy, and a Dignified But Withering Rebuke of the Injustice and the Time-Serving of British Protestant Letter Writers... | 1857 | English | Protestantism | |
| A Vindication of the Catholic Church: In a Series of Letters Addressed to the Rt. Rev. John Henry Hopkins, Protestant Episcopal Bishop of Vermont | Kenrick, Francis Patrick; 1796-1863. | 1855 | English | Hopkins, John Henry |
| A.P.A. Movement: A Sketch, The | Desmond, Humphrey J. (Humphrey Joseph); 1858-1932. | 1912 | English | Anti-Catholicism |
| Abbè de Lamennais and the Liberal Catholic Movement in France, The | Gibson, W. (William); 1868-1942. | 1896 | English | Liberalism (Religion) |
| Abduction of Mary Ann Smith, by the Roman Catholics:and Her Imprisonment in a Nunnery, for Becoming a Protestant, The | Mattison, Hiram; 1811-1868. | 1868 | English | Anti-Catholicism |
| Abendländische Palästinapilger Des Ersten Jahrtausends Und Ihre Berichte: Eine Kulturgeschichtliche Skizze | Baumstark, Anton; 1872-1948. | 1906 | German | Christian pilgrims and pilgrimages |
| Abrègè de Thèologie Sociale D'après Les Grands Auteurs | Hourcade, Laurent. | 1909 | French | Sociology, Christian (Catholic) |
| Acknowledged Doctrines of the Church of Rome: Being an Exposition of Roman Catholic Doctrines as Set Forth byEsteemed Doctors of the Said Church, and Confirmed by Repeated Publication, With the Sanction of Bishops and Ministers of Her…, The | 1850 | English | Catholic Church | |
| Acta Et Decreta Primae Provincialis Synodi Tokiensis A.D. 1895: Cum Mutationibus A S. Cong. de Propaganda Fide Inductis. | 1896 | Latin | Catholic Church | |
| Acta Et Decreta Sacrosancti Et Oecumenici ConcilII Vaticani: Die 8. Decembris 1869 A SS. D.N. Pio P. IX. Inchoati. | 1871 | Latin | Catholic Church | |
| Acta PII Pp. X: Modernismi Errores Reprobantis | 1907 | Latin | Modernism | |
| Acta SS. D.N. PII Pp. IX: Ex Quibus Excerptus Est Syllabus Editus Die VIII. Decembris MDCCCLXIV. | Pius; IX; Pope; 1792-1878. | 1865 | Latin | Catholic Church |
| Acts of English Martyrs: Hitherto Unpublished | Pollen, John Hungerford; 1858-1925. | 1891 | English | Christian martyrs |
| Additamenta Ad Synopsim Theologiae Pro Anno 1908 | Tanquerey, Adolphe; 1854-1932. | 1908 | Latin | Catholic Church |
| Adornment of the Spiritual Marriage; the Sparkling Stone; the Book of Supreme Truth, The | Ruusbroec, Jan van; 1293-1381. | 1916 | English | Mysticism |
| Adventures of a Protestant in Search of a Religion, The | Waller, John Francis; 1810-1894. | 1879 | English | Catholic converts |
| Advis Et Devis de La Sovrce de Lidolatrie Et Tyrannie Papale, Par Qvelle Practiqve Et Finesse Les Papes Sont En Si Haut Degre Montez: Suiuis Des Difformes Reformateurz, de Laduis Et Deuis de Menconge Et Des Faulx Miracles Du Temps Present | Bonivard, Francìois; 1493-1570. | 1856 | Middle French | Papacy |
| Aeneas Sylvius Piccolomini Als Papst Pius II: Sein Leben Und Einfluss Auf Die Literarische Cultur Deutschlands: Rede Gehalten Bei Der Feierlichen Inauguration Als Rector Magnificus Der K.K. Karl-Franzens-Universität in Graz Am 4. November | Weiss, Anton; 1852-1912. | 1897 | German | Popes |
| Afgoden-Dienst Der Jesuiten in China: Waar Over Fy Nog Heden Beschuldigt Worden Aan Het Hof Van Romen: Nevens Hare Verandwoordinge, Nu Getrouwelijk Uyt Het Latyn Vertaald, En Met Overtuygende Aanmerkingen Over Den Verkeerden Handel, Fo Der | Mauritius, Joannes. | 1711 | Dutch | Jesuits |
| Agapè and the Eucharist in the Early Church: Studies in the History of the Christian Love-Feasts, The | Keating, J. F. (John Fitzstephen); 1850-1911. | 1901 | English | Agape |
| Age of Schism: Being an Outline of the History of the Church From A.D. 1304 to A.D. 1503, The | Bruce, Herbert; 1877-1935. | 1907 | English | Schism, The Great Western, 1378-1417 |
| Age of the Great Western Schism, The | Locke, Clinton; 1829-1904. | 1896 | English | Schism, The Great Western, 1378-1417 |
| Age of the Renascence: An Outline Sketch of the History of the Papacy From the Return From Avignon to the Sackof Rome (1377-1527), The | Van Dyke, Paul; 1859-1933. | 1897 | English | Papacy |
| Aktenstücke Die Altkatholische Bewegung Betreffend: Mit Einem Grundriss Der Geschichte Derselben: Zugleich Als Fortsetzung Und Ergänzung Der "Sammlung Der Aktenstücke Zum Ersten Vatikanischen Concil" | Friedberg, Emil. | 1876 | German | Old Catholicism |
| Aktenstücke Zum Concil: Das Infallibilitätsschema Und Die Minoritätsgutachten: Originaltext Und Uebersetzung. | 1870 | German | Popes | |
| Alfabeto Christiano: Which Teaches the True Way to Acquire the Light of the Holy Spirit | Valdès, Juan de; d. 1541. 1n | 1861 | English | Christian life |
| America or Rome, Christ or the Pope | Brandt, John L. (John Lincoln); 1860-1946. | 1895 | English | Catholic Church |
| American Catholic Quarterly Review, and "the Faith of Our Forefathers": The Case as It Stands, The | Stearns, Edward Josiah; 1810-1890. | 1880 | English | Stearns, Edward Josiah |
| American Protective Association Explained: Its Principles, Methods and Objects for the Instruction of Membersand Those Who Wish to Become Such., The | 1909 | English | Anti-Catholicism | |
| An Advanced Catechism of Catholic Faith and Practice: Based Upon the Third Plenary Council Catechism: For Use in the Higher Grades of Catholic Schools | 1913 | English | Catholic Church | |
| An Apology for the Religious Orders: Being a Translation From the Latin of Two of the Minor Works of the Saint | Thomas; Aquinas, Saint; 1225?-1274. | 1902 | English | Monasticism and religious orders |
| An Appeal to Truth: A Letter | 1916 | English | World War, 1914-1918 | |
| An Den Christlichen Adel Deutscher Nation: Von Des Christlichen Standes Besserung | Luther, Martin; 1483-1546. | 1884 | German | Catholic Church |
| An English Carmelite: The Life of Catharine Burton, Mother Mary Xaveria of the Angels, of the English Teresian Convent at Antwerp: Collected From Her Own Writings and Other Sources | Burton, Catharine. | 1876 | English | Burton, Catharine |
| An Essay in Aid of the Better Appreciation of Catholic Mysticism: Illustrated From the Writings of Blessed Angela of Foligno | Thorold, Algar Labouchere; 1866-1936. | 1900 | English | Mysticism |
| An Explanation of the Baltimore Catechism of Christian Doctrine: For the Use of Sunday School Teachers and Advanced Classes | Kinkead, Thomas L. | 1891 | English | Catholic Church |
| An Inside View of the Vatican Council: In the Speech of the Most Reverend Archbishop Kenrick of St. Louis | Kenrick, Peter Richard; 1806-1896. | 1870 | English | Popes |
| An Meine Kritiker: Beleuchtung Verschiedener Angriffe Auf Meine Geschichte Der Griechischen Kirchentrennung, Insbesondere Von Prof. Hergenröther, Prof. Mittermüller Und Im Münchener Pastoralblatt | Pichler, A. (Aloys); 1833-1874. | 1865 | German | Schism |
| An Old-Catholic View of Confession: Being the Pamphlet Compulsory Auricular Confession as Practised in the Church of Rome, a Human Invention | Herzog, Eduard; 1841-1924. | 1905 | English | Confession |
| Analecta Romana: Kirchengeschichtliche Forschungen in Römischen Bibliotheken Und Archiven: Eine Denkschrift | Lämmer, Hugo. | 1861 | German | Catholic Church |
| Ancient British and Irish Churches: Including the Life and Labors of St. Patrick, The | Cathcart, William; 1826-1908. | 1894 | English | Celtic church |
| Ancient Catholic Church: From the Accession of Trajan to the Fourth General Council (A.D. 98-451), The | Rainy, Robert; 1826-1906. | 1902 | English | Church history |
| Andachts-Büchlein Zu Ehren Der Elf Martyrer-Schaaren Aus Der Gesellschaft Jesu: Die Pius IX Am St. Petrustage 1867 Selig Gesprochen | Weninger, F. X. (Francis Xavier); 1805-1888. | 1868 | German | Christian martyrs |
| Andachtsbüchlein Zu Ehren Der Zwei Seligen, Johannes Und Andreas: Priester Und Märtyrer Der Gesellschaft Jesu | Weninger, F. X. (Francis Xavier); 1805-1888. | 1854 | German | Christian martyrs |
| Andachtsbüchlein Zu Ehren Des Seligen Peter Claver: Priester Der Gesellschaft Jesu Und Apostel Von Central-amerika | Weninger, F. X. (Francis Xavier); 1805-1888. | 1852 | German | Claver, Pedro |
| Angels of the Battlefield: A History of the Labors of the Catholic Sisterhoods in the Late Civil War | Barton, George; 1866-1940. | 1897 | English | Nuns |
| Anglican Church in the Nineteenth Century: Indicating Her Relative Position to Dissent in Every Form, and Presenting a Clear and Unprejudiced View of Puseyism and Orthodoxy, The | Uhden, H. F. (Hermann Ferdinand); 1812-1888. | 1844 | English | Oxford movement |
| Anglican-Ritualism as Seen by a Catholic and Foreigner: A Series of Essays: With an Appendix on the Present Position of the Church in France | Martin; abbè; (Paulin); 1840-1890. | 1881 | English | Ritualism |
| Annales Ecclèsiastiques de 1846 À 1860, Ou, Histoire Rèsumèe de L'eglise Catholique Pendant Les Dernières Annèes | Chantrel, J. (Joseph); 1818-1884. | 1861 | French | Catholic Church |
| Anointing of the Sick in Scripture and Tradition: With Some Considerations on the Numbering of the Sacraments, The | Puller, F. W. (Frederick William); 1843-1938. | 1910 | English | Unction |
| Answer of the Great Church of Constantinople to the Papal Encyclical on Union: In the Original Greek With an English Translation | 1896 | Greek | Catholic Church | |
| Answers to Objections Against the Catholic Religion | Sègur; Mgr. de; (Louis Gaston); 1820-1881. | 1890 | English | Catholic Church |
| Antidote to the Poison of Popery: In the Writings and Conduct of Professors Nevin & Schaff, Professors in the German Reformed Church in the U.S. of America | Janeway, J. J. (Jacob Jones); 1774-1858. | 1856 | English | Papacy |
| Anti-Janus: An Historico-Theological Criticism of the Work, Entitled "the Pope and the Council," by Janus | Hergenròther, Joseph; 1824-1890. | 1870 | English | Popes |
| Anti-Janus: Eine Historisch-Theologische Kritik Der Schrift "Der Papst Und Das Concil" Von Janus | Hergenröther, Joseph; 1824-1890. | 1870 | German | Popes |
| Anti-Modernisteneid, Freie Forschung Und Theologische Fakultäten: Mit Anhang, Der Anti-Modernisteneid, Lateinisch Und Deutsch, Nebst Aktenstücken | Mulert, Hermann; 1879-1950. | 1911 | German | Modernism |
| Antipapal Tracts of the Fourteenth Century, The | Schaff, David S. (David Schley); 1852-1941. | 1901 | English | Papacy |
| Apocalyptical Key: An Extraordinary Discourse on the Rise and Fall of Papacy, or, The Pouring Out of the Vials in the Revelation of St. John, Chapter XVI: Containing Predictions Respecting the Revolutions of France, the Fate of Its Monarch | Fleming, Robert; 1660?-1716. | 1855 | English | Catholic Church |
| Apostleship of Prayer: A Holy League of Christian Hearts United With the Heart of Jesus: To Obtain the Triumphof the Church and the Salvation of Souls: Preceded by a Brief of the Sovereign Pontiff Pius IX, the Approbation of Several…, The | Ramière, H. (Henri); 1821-1884. | 1866 | English | Prayer |
| Apostolical and Primitive Church: Popular in Its Government, Informal in Its Worship: A Manual on Prelacy andRitualism, The | Coleman, Lyman; 1796-1882. | 1869 | English | Church polity |
| Appeal of Romanism to Educated Protestants: A Paper Read Before the Evangelical Alliance, New York, October 8,1873, The | Storrs, Richard S. (Richard Salter); 1787-1873. | 1883 | English | Catholic Church |
| Appellatio Flaviani: The Letters of Appeal From the Council of Ephesus, A.D. 449, Addressed by Flavian and Eusebius to St. Leo of Rome | Flavian; Saint, Patriarch of Constantinople; d. 449. | 1903 | English | Leo |
| Appendix to Five Lectures on Attrition, Contrition, and Sovereign Love | Ward, William George; 1812-1882. | 1892 | English | Repentance |
| Apple of Discord, or, Temporal Power in the Catholic Church, The | Zurcher, George; 1852-1931. | 1905 | English | Popes |
| Après Le Concile, Ou, Hyacinthe Et Doellinger | 1872 | French | Popes | |
| Archbishop's Champion Brought to Book | Stearns, Edward Josiah; 1810-1890. | 1881 | English | Augustinis, Aemilius M. de |
| Arguments of Romanists: From the Infallibility of the Church and the Testimony of the Fathers in Behalf of theApocrypha, The | Thornwell, James Henley; 1812-1862. | 1845 | English | Catholic Church |
| Ars Ignatiana Animorum Ad Deum Per Christum Adducendorum: Quae Latet in Libro Exercitiorum Spiritualium | Nonell, Iacobus. | 1888 | Latin | Ignatius |
| Articles on Romanism: Monsignor Capel, Dr. Littledale | Hopkins, John Henry; 1792-1868. | 1890 | English | Capel |
| As David and the Sibyls Say: A Sketch of the Sibyls and the Sibylline Oracles | Monteiro, Mariana. | 1905 | English | Sibyls |
| Aspirations of Nature | Hecker, Isaac Thomas; 1819-1888. | 1869 | English | Protestantism |
| Assertio Septem Sacramentorum, or, Defence of the Seven Sacraments | Henry; VIII; King of England; 1491-1547. | 1908 | Latin | Sacraments |
| At Home With God: Priedieu Papers on Spiritual Subjects | Russell, Matthew; 1834-1912. | 1910 | English | Christian life |
| Atlas Hierarchicus: Descriptio Geographica Et Statistica S. Romanae Ecclesiae Tum Occidentis Tum Orientis Juxta Statum Praesentem: Accedunt Etiam Nonnullae Notae Historicae Necnon Ethnographicae | Streit, Karl; 1874-1935. | 1913 | Multiple | Ecclesiastical geography |
| Augustine of Canterbury | Cutts, Edward Lewes; 1824-1901. | 1895 | English | Augustine |
| Aus Dem Inneren Leben Der Katholischen Kirche Im XIX. Jahrhundert. Erster Band | Nielsen, Fredrik; 1846-1907. | 1882 | German | Catholic Church |
| Aus Den Tagen Bonifaz VIII: Funde Und Forschungen | Finke, Heinrich; 1855-1938. | 1902 | German | Popes |
| Aus Deutschen Bussbüchern: Ein Beitrag Zur Deutschen Culturgeschichte | Friedberg, Emil. | 1868 | German | Penance |
| Aus Englischen Bibliotheken | Levison, Wilhelm. | 1910 | German | Papacy |
| Authority, or, A Plain Reason for Joining the Church of Rome | Rivington, Luke; 1838-1899. | 1897 | English | Popes |
| Autour Du Concile: Souvenirs Et Croquis D'un Artiste À Rome: Ce Qui Se Passe Au Concile Types Et Cèrèmonies, Le Vatican Intime, Rome Capitale | Yriarte, Charles; 1832-1898. | 1887 | French | Vatican Council |
| Back to Holy Church: Experiences and Knowledge Acquired by a Convert | Ruville, Albert von; 1855-1934. | 1910 | English | Catholic converts |
| Bathory Et Possevino: Documents Inèdits Sur Les Rapports Du Saint-Siège Avec Les Slaves | 1887 | French | Possevino, Antonio | |
| Beata Virgo Maria in Suo Conceptu Immaculata Ex Monumentis Omnium Seculorum Demonstrata: Accedit Amplissima Literatura | Roskovàny, Augustino de; 1807-1892. | 1873 | Latin | Immaculate Conception |
| Before the Table: An Inquiry, Historical and Theological, Into the True Meaning of the Consecration Rubric in the Communion Service of the Church of England, With Appendix and Supplement, Containing Papers by the Right Rev. the Bishop of St. | Howson, J. S. (John Saul); 1816-1885. | 1875 | English | Lord's Supper |
| Beginnings of English Christianity: With Special Reference to the Coming of St. Augustine, The | Collins, William Edward; 1867-1911. | 1898 | English | Augustine |
| Beiträge Zur Geschichte Des Jesuitenordens | Reusch, F. H. (Franz Heinrich); 1825-1900. | 1894 | German | Jesuits |
| Beiträge Zur Geschichte Des Jesuiten-Ordens | Friedrich, J. (Johann); 1836-1917. | 1881 | German | Jesuits |
| Beiträge Zur Geschichte Des Spanischen Protestantismus Und Der Inquisition: Im Sechzehnten Jahrhundert; Nach Den Originalakten in Madrid Und Simancas | Schäfer, Ernst; 1872-1946. | 1902 | German | Inquisition |
| Bergson: An Exposition and Criticism From the Point of View of St. Thomas Aquinas | Gerrard, Thomas J. (Thomas John); 1871-1916. | 1913 | English | Bergson, Henri |
| Bernard Dèlicieux Et L'inquisition Albigeoise (1300-1320) | Haurèau, B. (Barthèlemy); 1812-1896. | 1877 | French | Inquisition |
| Bible and Its Interpreter, The | Casey, Patrick H. 1861-1941. | 1900 | English | Catholic Church |
| Bible and the Catholic Church: A Lecture, The | Moriarty, James J. (James Joseph); 1843-1887. | 1883 | English | Catholic Church |
| Bible and the Papacy, The | Belaney, R. (Robert) | 1889 | English | Popes |
| Bibliotheca Historica MedII Aevi: Wegweiser Durch Die Geschichtswerke Des Europàischen Mittelalters Bis 1500: Vollstàndiges Inhaltsverzeichniss Zu "Acta Sanctorum" Boll, Bouquet, Migne, Monum. Germ. Hist., Muratori, Rerum Britann. Script | Potthast, August; 1824-1898. | 1896 | Latin | Middle Ages |
| Bibliothektechnisches Aus Der Vatikana | Ehrle, Franz; 1845-1934. | 1916 | German | Biblioteca apostolica vaticana |
| Biographical Cyclopaedia of the Catholic Hierarchy of the United States, 1784-1898: A Book for Reference in the Matter of Dates, Places and Persons, in the Records of Our Bishops, Abbots and Monsignori | Reuss, Francis X. | 1898 | English | Catholics |
| Biographies of English Catholics in the Eighteenth Century | Kirk, John; 1760-1851. | 1909 | English | Catholics |
| Bishop Gore and the Catholic Claims | Chapman, John; 1865-1933. | 1905 | English | Gore, Charles |
| Blessed Sacrament, or, The Works & the Ways of God, The | Faber, Frederick William; 1814-1863. | 1861 | English | Lord's Supper |
| Blessed Virgin in the Nineteenth Century: Apparitions, Revelations, Graces, The | St. John, Bernard. | 1903 | English | Mary |
| Blessed Virgin, The | 1800 | English | Mary | |
| Blitzstrahl Wider Rom: Die Verfassung Der Christlichen Kirche Und Der Geist Des Christenthums | Baader, Franz von; 1765-1841. | 1871 | German | Popes |
| Bolland En Petrus | Schaepman, H. J. A. M. (Herman Johan Aloysius Maria); 1844-1903. | 1899 | Dutch | Popes |
| Book of Divine Consolation of the Blessed Angela of Foligno, The | Angela; of Foligno; 1248?-1309. | 1909 | English | Meditations |
| Book of Popery: A Manual for Protestants Descriptive of the Origin, Progress, Doctrines, Rites, and Ceremoniesof the Papal Church, The | Cobbin, Ingram; 1777-1851. | 1840 | English | Catholic Church |
| Book of Saint Basil the Great, Bishop of Caesarea in Cappadocia, on the Holy Spirit: Written to Amphilochius,Bishop of Iconium, Against the Pneumatomachi: A Revised Text, The | Basil; Saint, Bishop of Caesarea; ca. 329-379. | 1892 | Greek | Holy Spirit |
| Both Sides of the Controversy Between the Roman and Reformed Churches: Being I. "A Doctrinal Catechism," Etc. | Hughes, John; 1797-1864. | 1859 | English | Protestantism |
| Bread of Life, or, St. Thomas Aquinas on the Adorable Sacrament of the Altar, The | Thomas; Aquinas, Saint; 1225?-1274. | 1879 | English | Lord's Supper |
| Breviarum Lugdunense Scriptum a Stephano MantillarII Sacerdotem Parochiae Sancti-Symphoriani-Castri Anno 1487, Cuius Nomen Legitur Bis in Codice, Scilicet FolIIs 142v Et 341v. | 1452 | Latin | Catholic Church | |
| Brevis Analysis Tractatus de Deo Creatore | Jungmann, Bernardus. | 1875 | Latin | God |
| Briefe Und Erklärungen Von J. Von Döllinger Über Die Vaticanischen Decrete, 1869-1887 | Döllinger, Johann Joseph Ignaz von; 1799-1890. | 1890 | German | Catholics |
| Brooksiana, or, The Controversy Between Senator Brooks and Archbishop Hughes: Growing Out of the Recently Enacted Church Property Bill | 1870 | English | Church property | |
| Brothers of Holy Cross, The | Trahey, James J. (James Joseph); 1875-1906. | 1904 | English | Congregation of Holy Cross |
| Bull "Ineffabilis" in Four Languages, or, The Immaculate Conception of the Most Blessed Virgin Mary Defined: With an Introduction, and a Dissertation on the Art of Illuminating, The | 1868 | English | Immaculate Conception | |
| Bull Apostolicae Curae and the Edwardine Ordinal, The | Puller, F. W. (Frederick William); 1843-1938. | 1896 | English | Anglican orders |
| Bussstufen Und Katechumenatsklassen | Schwartz, Eduard; 1858-1940. | 1911 | German | Penance |
| Bygone Church Life in Scotland | 1899 | English | Christian antiquities | |
| Cabinet of Catholic Information: A Collection of Lectures and Writings of Eminent Prelates and Priests of the Catholic Church in America and Europe | 1903 | English | Catholic Church | |
| Caeremoniale Iuxta Ritum Romanum | Aloysio Maria; a Carpo, p. d. 1885? | 1874 | Latin | Catholic Church |
| Camps' Answer to Dr. Forbes: The Church of Rome Vindicated From Every Calumny: With Epistle Dedicatory to Father Dayman | Camps, F. F. F. | 1859 | English | Forbes, John Murray |
| Canones Et Decreta ConcilII Tridentini: Ex Editione Romana A. MDCCCXXXIV Repetiti: Accedunt S. Congr. Card. Conc. Trid. Interpretum Declarationes Ac Resolutiones Ex Ipso Resolutionum Thesauro, Bullario Romano Et Benedicti XIV. S.p. Operibus, | 1853 | Latin | ||
| Canons and Decrees of the Sacred and Oecumenical Council of Trent: Celebrated Under the Sovereign Pontiffs, Paul III, Julius III and Pius IV, The | 1848 | English | Council of Trent | |
| Canons of the First Four General Councils of Nicaea, Constantinople, Ephesus and Chalcedon, The | Bright, William; 1824-1901. | 1892 | English | Canon law |
| Canons of the First Four General Councils of the Church: And Those of the Early Local Greek Synods, in Greek With Latin and Revised English Translations in Parallel Columns, With Notes Selected From Zonaras, Balsamon, Bishop Beveridge, &c, The | 1868 | Greek | Canon law | |
| Cardinal Mercier's Retreat to His Priests | Mercier, Dèsirè; 1851-1926. | 1912 | English | Clergy |
| Cardinal Newman and the Encyclical Pascendi Dominici Gregis: An Essay | O'Dwyer, Edward Thomas; 1842-1917. | 1908 | English | Modernism |
| Carmel in Ireland: A Narrative of the Irish Province of Teresian, or, Discalced Carmelites, A.D. 1625-1896: With a Supplement Chiefly From Letters of Irish Missionaries of the Seventeenth Century | Rushe, James P. | 1903 | English | Discalced Carmelites |
| Cartas de Kirwan Al M.Y. Señor Obispo de Nueva York | Kirwan; 1802-1861. | 1847 | Spanish | Papacy |
| Case of Pope Honorius: Reconsidered With Reference to Recent Apologies, The | Renouf, P. Le Page; (Peter Le Page); 1822-1897. | 1869 | English | Monothelitism |
| Catechism Explained: An Exhaustive Exposition of the Christian Religion, With Special Reference to the PresentState of Society and the Spirit of the Age: A Practical Manual ..., The | Spirago, Francis; b. 1862. | 1899 | English | Catholic Church |
| Catechism of Christian Doctrine | Deharbe, Joseph; 1800-1871. | 1901 | English | Catholic Church |
| Catechism of Rodez Explained in Form of Sermons: A Work Equally Useful to the Clergy, Religious Communities, and Faithful, The | Luche; abbè. | 1917 | English | Catholic Church |
| Catechism of the Christian Religion: Being, With Some Small Changes, a Compendium of the Catechism of Montpellier, in Which, by the Light of Scripture and Tradition, Are Explained the History, Dogmas, Morality, Sacraments, Prayers, Ceremonies | Keenan, Stephen; 1805-1862. | 1852 | English | Catholic Church |
| Catechism of the Council of Trent | 1914 | English | Catholic Church | |
| Catechism on Modernism: According to the Encyclical "Pascendi Dominici Gregis" of His Holiness, Pius X. | Lemius, J. B. (Jean Baptiste) | 1908 | English | Modernism |
| Catechismi Tres Systematice Coordinati Pro Plena Juventutis Christianae Instructione | Weninger, F. X. (Francis Xavier); 1805-1888. | 1871 | Latin | Catechisms, Latin |
| Catechismo Sul Modernismo: Secondo L'enciclica Pascendi Dominici Gregis Di Sua Santità Pio X | Lemius, J. B. (Jean Baptiste) | 1908 | Italian | Modernism |
| Cathechismus Ex Decreto ConcilII Tridentini Ad Parochos PII V. Et Clementis XIII Pont. Max: Jussu Editus Ad Editionem Romae A.D. MDCCCXIV. Publici Iuris Factam Accuratissime Expressus. | 1905 | Latin | Catholic Church | |
| Cathechismus Pro Ljs, Qui Volunt Suscipere Baptismvm in Octo Dies Diuisus; Phèp Giang Tàm Ngày...Ope Sacrã Congregationis de Propaganda Fide in Lucem Editus; Ab Alexandro de Rhodes... | Rhodes, Alexandre de; 1591-1660. | 1651 | Latin | Catholic church |
| Catholic and Protestant Countries Compared: In Civilization, Popular Happiness, General Intelligence, and Morality | Young, Alfred; 1831-1900. | 1898 | English | Protestantism |
| Catholic Belief, or, A Short and Simple Exposition of Catholic Doctrine | Di Bruno, Joseph Faà. | 1912 | English | Catholic Church |
| Catholic Church and Christian State: A Series of Essays on the Relation of the Church to the Civil Power | Hergenròther, Joseph; 1824-1890. | 1876 | English | Church and state |
| Catholic Church From Within, The | 1901 | English | Catholic Church | |
| Catholic Church in Colonial Days: The Thirteen Colonies, the Ottawa and Illinois Country, Louisiana, Florida,Texas, New Mexico and Arizona, 1521-1763: With Portraits, Views, Maps and Facsimiles, The | Shea, John Dawson Gilmary; 1824-1892. | 1886 | English | Catholic Church |
| Catholic Church in New York: A History of the New York Diocese From Its Establishment in 1808 to the Present Time, The | Smith, John Talbot; 1855-1923. | 1905 | English | Catholic Church |
| Catholic Church in the United States of America: Undertaken to Celebrate the Golden Jubilee of His Holiness, Pope Pius X., The | 1912 | English | Catholic Church | |
| Catholic Church, the Renaissance and Protestantism: Lectures Given at the Catholic Institute of Paris, Januaryto March 1904, The | Baudrillart, Alfred. | 1908 | English | Renaissance |
| Catholic Conception of the Church: A Study of the Traditional Idea of the Nature and Constitution of the Church, The | Sparrow-Simpson, W. J. (William John); 1859-1952. | 1914 | English | Church |
| Catholic Democracy: Individualism and Socialism | Day, Henry C. (Henry Cyril); b. 1865. | 1914 | English | Socialism |
| Catholic Doctrine of Faith and Morals, Gathered From Sacred Scripture, Decrees of Councils, and Approved Catechisms, The | Byrne, William; 1836-1912. | 1892 | English | Catholic Church |
| Catholic Dogma: The Antidote of Doubt | McLaren, William Edward; 1831-1905. | 1884 | English | Catholic Church |
| Catholic Educational Conditions in the United States | Macksey, Charles; 1863-1919. | 1913 | English | Catholic Church |
| Catholic Eschatology and Universalism: An Essay on the Doctrine of Future Retribution | Oxenham, Henry Nutcombe; 1829-1888. | 1878 | English | Future punishment |
| Catholic Faith, or, Doctrines of the Church of Rome Contrary to Scripture and the Teaching of the Primitive Church, The | Treat, John Harvey; 1839-1908. | 1888 | English | Catholic Church |
| Catholic Interests in the Nineteenth Century | Montalembert, Charles Forbes; comte de; 1810-1870. | 1852 | English | Church and state |
| Catholic Life and Letters of Cardinal Newman: With Notes on the Oxford Movement and Its Men | Newman, John Henry; 1801-1890. | 1885 | English | Cardinals |
| Catholic London a Century Ago | Ward, Bernard; 1857-1920. | 1905 | English | Catholic Church |
| Catholic Reform: Letters, Fragments, Discourses | Hyacinthe; père; 1827-1912. | 1874 | English | Popes |
| Catholic School System in the United States: Its Principles, Origin, and Establishment, The | Burns, J. A. (James Aloysius); 1867-1940. | 1908 | English | Catholic Church |
| Catholic Socialism | Nitti, Francesco Saverio; 1868-1953. | 1895 | English | Socialism and Catholic Church |
| Catholic Truth and Historical Truth | Coulton, G. G. (George Gordon); 1858-1947. | 1906 | English | Catholic Church |
| Catholic View of the Public School Question: A Lecture Delivered in the Hall of the Cooper Institute, Sunday Evening, January 16, 1870, The | Preston, Thomas S. (Thomas Scott); 1824-1891. | 1870 | English | Catholic schools |
| Catholic: Letters Addressed by a Jurist to a Young Kinsman Proposing to Join the Church of Rome, The | Derby, E. H. (Elias Hasket); 1803-1880. | 1856 | English | Catholic Church |
| Catholicism and Independence: Being Studies in Spiritual Liberty | Petre, Maude Dominica; 1863-1942. | 1907 | English | Modernism |
| Catholicism and the Vatican: With a Narrative of the Old Catholic Congress at Munich | Whittle, J. Lowry; (James Lowry) | 1872 | English | Old Catholic Church |
| Catholicisme Et Critique: Rèflexions D'un Profane Sur L'affaire Loisy | Desjardins, Paul; 1859-1940. | 1905 | French | Modernism |
| Catholicity in Philadelphia: From the Earliest Missionaries Down to the Present Time | Kirlin, Joseph L. J. (Joseph Louis J.); 1868-1926. | 1909 | English | Catholic Church |
| Catholics and the American Revolution | Griffin, Martin I. J. (Martin Ignatius Joseph); 1842-1911. | 1907 | English | Catholics |
| Catholics of Ireland Under the Penal Laws in the Eighteenth Century, The | Moran, Patrick Francis; 1830-1911. | 1900 | English | Catholics |
| Catholicus Reformatus: Hoc Est, Expositio Et Declaratio, Quae Ostendit Quatenus Ecclesiae Ex Dei Verbo Reformatae in Multis Ac Diversis Religionis Capitibus Cum Ecclesiae Rom. Qualis Ea Hodie Est, Consentiunt...Addita Est Brevis Quaedam Admonitio Ad Eo | Perkins, William; 1558-1602. | 1601 | Latin | Catholic Church |
| Cautions for the Times: Addressed to the Parishioners of a Parish in England by Their Former Rector | 1854 | English | Oxford movement | |
| Ce Qui Se Passe Au Concile | 1870 | French | Conciliar theory | |
| Celtic Church in Scotland: Being an Introduction to the History of the Christian Church in Scotland Down to the Death of Saint Margaret, The | Dowden, John; 1840-1910. | 1894 | English | Celtic Church |
| Censorship of the Church of Rome: And Its Influence Upon the Production and Distribution of Literature: A Study of the History of the Prohibitory and Expurgatory Indexes, Together With Some Consideration of the Effects of Protestant Cens, The | Putnam, George Haven; 1844-1930. | 1906 | English | Prohibited books |
| Centenary of Catholicity in Kentucky, The | Webb, Benedict Joseph; 1814-1897. | 1884 | English | Catholics |
| Centenary of Saint Peter and the General Council: A Pastoral Letter to the Clergy &c., The | 1867 | English | Catholic Church | |
| Centenary of the Society of Mary, The | Garvin, John E. | 1917 | English | Chaminade, Guillaume Joseph |
| Certain Difficulties Felt by Anglicans in Catholic Teaching Considered: In a Letter Addressed to the Rev. E.B. Pusey, D.D., on Occasion of His Eirenicon of 1864: And in a Letter Addressed to the Duke of Norfolk, on Occasion of Mr. Gladstone | Newman, John Henry; 1801-1890. | 1876 | English | Mary |
| Certain Difficulties Felt by Anglicans in Catholic Teaching Considered: In Twelve Lectures Addressed to the Party of the Religious Movement of 1833 | Newman, John Henry; 1801-1890. | 1879 | English | Oxford movement |
| Certainty in Religion | Wyman, Henry H. 1849-1929. | 1905 | English | Catholic Church |
| Certainty Unattainable in the Roman Church: A Consideration Bearing Upon Secession to Rome | Seymour, M. Hobart; (Michael Hobart); 1800-1874. | 1851 | English | Catholic Church |
| Chapters From the Religious History of Spain Connected With the Inquisition | Lea, Henry Charles; 1825-1909. | 1890 | English | Inquisition |
| Characteristics, Political, Philosophical, and Religious | Manning, Henry Edward; 1808-1892. | 1885 | English | Catholic Church |
| Christ the Bread of Life: An Attempt to Give a Profitable Direction to the Present Occupation of Thought With Romanism | Campbell, John McLeod; 1800-1872. | 1869 | English | Transubstantiation |
| Christ, the Church, and Man: An Essay on New Methods in Ecclesiastical Studies & Worship: With Some Remarks on a New Apologia for Christianity in Relation to the Social Question | Capecelatro, Alfonso; 1824-1912. | 1909 | English | Church and social problems |
| Christian Church in These Islands Before the Coming of Augustine, The | Browne, G. F. (George Forrest); 1833-1930. | 1899 | English | Great Britain |
| Christian Education in America: A Lecture | Keane, John J. | 1892 | English | Catholic Church |
| Christian Epigraphy: An Elementary Treatise: With a Collection of Ancient Christian Inscriptions Mainly of Roman Origin | Marucchi, Orazio; 1862-1931. | 1912 | English | Inscriptions, Christian |
| Christian Eucharist and the Pagan Cults, The | Groton, William Mansfield; 1850-1915. | 1914 | English | Lord's Supper |
| Christian Instructed in the Nature and Use of Indulgences, The | Maurel, F. A. (F. Antoine); 1803-1874. | 1901 | English | Indulgences |
| Christian Monasticism: From the Fourth to the Ninth Centuries of the Christian Era | Smith, I. Gregory; (Isaac Gregory); 1826-1920. | 1892 | English | Monasticism and religious orders |
| Christian Patience: The Strength & Discipline of the Soul: A Course of Lectures | Ullathorne, William Bernard; 1806-1889. | 1890 | English | Patience |
| Christian Sanctified by the Lord's Prayer, The | Grou, Jean Nicolas; 1731-1803. | 1885 | English | Spiritual life |
| Christian Truths: Lectures | Chatard, Francis Silas; 1834-1918. | 1881 | English | Catholic Church |
| Christian Virtues and the Means for Obtaining Them: Containing the Practice of the Love of Our Lord Jesus Christ, Treatise on Prayer as the Great Means of Obtaining Salvation, Directions for Acquiring the Christian Virtues, Rule of Life for... | Liguori, Alfonso Maria de'; Saint; 1696-1787. | 1855 | English | Christian life |
| Christianity and Infallibility: Both or Neither | Lyons, Daniel; d. 1895. | 1916 | English | Popes |
| Christianity at the Cross-Roads | Tyrrell, George; 1861-1909. | 1910 | English | Modernism |
| Christkatholische Dogmatik | Hermes, Georg; 1775-1831. | 1834 | German | Catholic Church |
| Christ's Kingdom on Earth, or, The Church and Her Divine Constitution, Organization, and Framework: Explained for the People | Meagher, Jas. L. (James Luke); 1848-1920. | 1892 | English | Church |
| Chronologie Der Römischen Bischöfe: Bis Zur Mitte Des Vierten Jahrhunderts | Lipsius, Richard Adelbert; 1830-1892. | 1869 | German | Papacy |
| Chronologie Des Apostolischen Zeitalters: Bis Zum Tode Der Apostel Paulus Und Petrus: Ein Versuch Über Die Chronologie Und Abfassungszeit Der Apostelgeschichte Und Der Paulinischen Briefe | Wieseler, Karl; 1813-1883. | 1848 | German | Apostles |
| Church and Modern Society: Lectures and Addresses, The | Ireland, John; 1838-1918. | 1897 | English | Church and social problems |
| Church and Social Problems, The | Husslein, Joseph; 1873-1952. | 1912 | English | Socialism and Catholic Church |
| Church and the Age: An Exposition of the Catholic Church in View of the Needs and Aspirations of the Present Age, The | Hecker, Isaac Thomas; 1819-1888. | 1896 | English | Catholic Church |
| Church and the Churches, or, The Papacy and the Temporal Power: An Historical and Political Review, The | Dòllinger, Johann Joseph Ignaz von; 1799-1890. | 1862 | English | Popes |
| Church and the Future, The | Tyrrell, George; 1861-1909. | 1910 | English | Modernism |
| Church and the Future; L'eglise Et L'avenir, The | Bourdon, Hilaire. | 1903 | English | Liberalism (Religion) |
| Church and the Ministry in the Early Centuries: The Eighteenth Series of the Cunningham Lectures, The | Lindsay, Thomas M. (Thomas Martin); 1843-1914. | 1903 | English | Church polity |
| Church in Italy, The | Pennington, Arthur Robert. | 1893 | English | Papacy |
| Church in Spain, The | Meyrick, Frederick; 1827-1906. | 1892 | English | Spain |
| Church Life in Colonial Maryland | Gambrall, Theodore C. (Theodore Charles) | 1885 | English | Maryland |
| Church of Christ the Same Forever, The | McErlane, D. (Daniel) | 1900 | English | Catholic Church |
| Church of God and the Bishops: An Essay Suggested by the Convocation of the Vatican Council, The | Liaño, Heinrich St. A. von. | 1870 | English | Catholic Church |
| Church of Our Fathers: As Seen in St. Osmund's Rite for the Cathedral of Salisbury: With Dissertations on theBelief and Ritual in England Before and After the Coming of the Normans, The | Rock, Daniel; 1799-1871. | 1903 | English | Catholic Church |
| Church of Rome: Her Present Moral Theology, Scriptural Instruction, and Canon Law: A Report on "the Books andDocuments on the Papacy," Deposited in the University Library, Cambridge, the Bodleian Library, Oxford, and the Library of Trin, The | M'Ghee, R. J. (Robert James) | 1852 | English | Catholic Church |
| Church of Scotland in the Thirteenth Century: The Life and Times of David de Bernham of St. Andrews, Bishop A.D. 1239 to 1253: With List of Churches Dedicated by Him, and Dates, The | Lockhart, William; 1820-1892. | 1892 | English | Bernham, David de |
| Church of the Bible, or, Scripture Testimonies to Catholic Doctrines & Catholic Principles, The | Oakeley, Frederick; 1802-1880. | 1857 | English | Catholic Church |
| Church Services and Service Books Before the Reformation | Swete, Henry Barclay; 1835-1917. | 1896 | English | Catholic Church |
| Church, the Churches, and the Sacraments, The | Beet, Joseph Agar; 1840-1924. | 1907 | English | Christianity |
| Churches Separated From Rome, The | Duchesne, L. (Louis); 1843-1922. | 1907 | English | Schism |
| Church's Ministry of Grace: Lectures, The | 1893 | English | Sacraments | |
| Church's One Foundation and One Priest, The | Friend to Roman Catholics. | 1851 | English | Catholic Church |
| Cities and Bishoprics of Phrygia: Being an Essay of the Local History of Phrygia From the Earliest Times to the Turkish Conquest, The | Ramsay, William Mitchell; Sir; 1851-1939. | 1895 | English | Inscriptions, Greek |
| Claims of the Roman Catholic Church Examined and Tested by Scripture, The | Spochynski, Stephen. | 1853 | English | Catholic Church |
| Clementis VII. Epistolae Per Sadoletum Scriptae: Quibus Accedunt Variorum Ad Papam Et Ad Alios Epistolae | Clement; VII; Pope; 1478-1534. | 1885 | Latin | Clement |
| Clementis XIV Pont. Max. Epistolae Et Brevia: Selectiora Ac Nonnulla Alia Acta Pontificatum Ejus | Clement; XIV; Pope; 1705-1774. | 1852 | Latin | Clement |
| Colecciòn de Bulas, Breves Y Otros Documentos Relativos a La Iglesia de America Y Filipinas | 1879 | Spanish | Catholic Church | |
| Comment L'èglise Romaine N'est Plus L'eglise Catholique | Michaud, E. (Eugène); 1839-1917. | 1872 | French | Catholic Church |
| Commentarius de Praerogativis Beati Petri, Apostolorum Principis | Passaglia, Carlo; 1812-1887. | 1850 | Latin | Popes |
| Compendium Theologiae Dogmaticae Et Moralis: Una Cum Praecipuis Notionibus Theologiae Canonicae, Liturgicae, Pastoralis Et Mysticae, Ac Philosophiae Christianae | Berthier, Jean-Baptiste; 1840-1908. | 1898 | Latin | Theology, Doctrinal |
| Compitum, or, The Meeting of the Ways at the Catholic Church | Digby, Kenelm Henry; 1800-1880. | 1851 | English | Catholic Church |
| Complete Works of the Most Rev. John Hughes, D.D., Archbishop of New York: Comprising His Sermons, Letters, Lectures, Speeches, Etc. | Hughes, John; 1797-1864. | 1865 | English | Catholic Church |
| Concil Und Jesuitismus: Brennende Fragen Zur Orientirung Für Das Deutsche Volk | Schwäbischer Theologe. | 1870 | German | Catholic Church |
| Concilia Provincialia, Baltimori Habita Ab Anno 1829 Usque Ad Annum 1849 | 1851 | Latin | Councils and synods, Provincial | |
| ConcilII PlenarII Baltimorensis II: In Ecclesia Metropolitana Baltimorensi, A Die VII. Ad Diem XXI. Octobris, A.D., MDCCCLXVI, Habiti, Et a Sede Apostolica Recogniti: Decreta | 1868 | Latin | Catholic Church | |
| Conclave of Clement X (1670), The | Bildt, Carl Nils Daniel Bildt; Freiherr von; 1850-1930. | 1903 | English | Popes |
| Condemnation of Pope Honorius, The | Renouf, P. Le Page; (Peter Le Page); 1822-1897. | 1868 | English | Monothelitism |
| Confèrences de Saint-Etienne: Ecole Pratique D'ètudes Bibliques, 1910-1911. | 1911 | French | Palestine | |
| Confessional: An Appeal to the Primitive and Catholic Forms in the East and in the West, The | Seymour, M. Hobart; (Michael Hobart); 1800-1874. | 1870 | English | Confession |
| Considerations Concerning the Sacrament of Our Lord's Body and Blood | Hall, A. C. A. (Arthur Crawshay Alliston); 1847-1930. | 1917 | English | Lord's Supper |
| Constitution & Law of the Church in the First Two Centuries, The | Harnack, Adolf von; 1851-1930. | 1910 | English | Church polity |
| Contest With Rome: A Charge to the Clergy of the Archdeaconry of Lewes, The | Hare, Julius Charles; 1795-1855. | 1856 | English | Newman, John Henry |
| Continuity of the Holy Catholic Church in England: A Lecture, The | Browne, G. F. (George Forrest); 1833-1930. | 1903 | English | Continuity of the church |
| Contrast, or, The Evangelical and Tractarian Systems Compared in Their Structure and Tendencies, The | Stone, John S. (John Seely); 1795-1882. | 1853 | English | Oxford movement |
| Contributions Chiefly to the Early History of the Late Cardinal Newman: With Comments | Newman, Francis William; 1805-1897. | 1891 | English | Oxford movement |
| Controversial Methods of Romanism, The | Brinckman, Arthur; Chaplain of St. Saviour's Hospital. | 1888 | English | Catholic Church |
| Controversial Statistics of Romanism, The | Brinckman, Arthur; Chaplain of St. Saviour's Hospital. | 1898 | English | Catholic Church |
| Conversations on Liberalism and the Church | Brownson, Orestes Augustus; 1803-1876. | 1870 | English | Liberalism (Religion) |
| Convert, or, Leaves From My Experience, The | Brownson, Orestes Augustus; 1803-1876. | 1877 | English | Catholic converts |
| Corona Di Laudi A Maria Vergine Immacolata Ed A Gesuì€ Cristo Suo Divin Figliuolo | Ferrè, Pietro M. | 1859 | Italian | Mary |
| Correspondence on Infallability sic: Between a Father Jesuit and General Alexander Kireeff, an Eastern Orthodox. | Kireev, Alexsandr Alekseevich; 1833-1910. | 1896 | English | Popes |
| Councils, Ancient and Modern: From the Apostolical Council of Jerusalem, to the Oecumenical Council of Nicaea, and to the Last Papal Council in the Vatican | Rule, William Harris; 1802-1890. | 1870 | English | Councils and synods |
| Count Campello: An Autobiography: Giving His Reasons for Leaving the Papal Church | Di Campello, Enrico; Count. | 1881 | English | Ex-priests, Catholic |
| Counter-Reformation in Europe, The | Pennington, Arthur Robert. | 1899 | English | Counter-Reformation |
| Counter-Reformation, The | Ward, Adolphus William; Sir; 1837-1924. | 1888 | English | Counter-Reformation |
| Course of Study and Syllabus in American and Irish History for the Elementary Schools of the Archdiocese of New York | 1911 | English | United States | |
| Course of Study and Syllabus in Drawing for the Elementary Schools of the Archdiocese of New York | 1911 | English | Drawing | |
| Course of Study and Syllabus in Geography and Mathematics for the Elementary Schools of the Archdiocese of New York | 1911 | English | Geography | |
| Course of Study and Syllabus in Physical Culture, Physiology and Hygiene, Nature Study for the Elementary Schools of the Archdiocese of New York | 1911 | English | Physiology | |
| Courtier, Monk and Martyr: A Sketch of the Life and Sufferings of Blessed Sebastian Newdigate of the London Charterhouse | Camm, Bede; 1864-1942. | 1901 | English | Christian martyrs |
| Credentials of the Catholic Church, The | Bagshawe, J. B. (John B.) | 1885 | English | Catholic Church |
| Creed Explained, or, An Exposition of Catholic Doctrine: According to the Creeds of Faith and the Constitutions and Definitions of the Church, The | Devine, Arthur; 1849-1919. | 1903 | English | Catholic Church |
| Crisis Among the French Clergy, The | Houtin, Albert; 1867-1926. | 1910 | English | Catholic Church |
| Curse and Chains of Roman Catholicism: A Controversy, The | Wharton, H. M. | 1888 | English | Disputations, Religious |
| Curse of Rome: A Frank Confession of a Catholic Priest, and a Complete Exposè of the Immoral Tyranny of the Church of Rome, The | MacGrail, Joseph F. | 1907 | English | Catholic Church |
| Cyprian Und Der Römische Primat: Eine Kirchen-Und Dogmengeschichtliche Studie | Koch, Hugo; 1869- | 1910 | German | Papacy |
| Damasus, Bischof Von Rom: Ein Beitrag Zur Geschichte Der Anfänge Des Römischen Primats | Rade, Martin; 1857-1940. | 1882 | German | Popes |
| Dangers of the Day | Vaughan, John S. (John Stephen); 1853-1925. | 1909 | English | Christian life |
| Das Abendmahl in Neuen Testament | Eichhorn, Albert; 1856-1926. | 1898 | German | Last Supper |
| Das Allgemeine Concil Und Seine Bedeutung Für Unsere Zeit | Ketteler, Wilhelm Emmanuel; Freiherr von; 1811-1877. | 1869 | German | Councils and synods |
| Das Allgemeine Concil Von Vatican: Zwei Hirtenschreiben | Rauscher, Joseph Othmar. | 1870 | German | Catholic Church |
| Das Basler Konzil: Seine Berufung Und Leitung, Seine Gliederung Und Seine Behördenorganisation | Lazarus, Paul; b. 1888. | 1912 | German | Council of Basel (1431-1449) |
| Das Concil Zu Konstanz: Ein Protestantenvereins-Vortrag | Trautz, Th. | 1874 | German | Council of Constance |
| Das Feierliche Gelübde Als Ehehindernis: In Seiner Geschichtlichen Entwicklung | Scharnagl, Anton; b. 1877. | 1908 | German | Marriage (Canon law) |
| Das Fortleben Des Heidentums in Der Altchristlichen Kirche | Soltau, Wilhelm; 1846-1924. | 1906 | German | Paganism |
| Das Furchtproblem in Der Katholischen Lehre Von Augustin Bis Luther | Hunzinger, A. W. (August Wilhelm); b. 1871. | 1906 | German | Fear |
| Das Generalkonzil Im Grossen Abendländischen Schisma | Bliemetzrieder, Franz. | 1904 | German | Schism, The Great Western, 1378-1417 |
| Das Gnadenbild Der Mater Ter Admirabilis Von Ingolstadt in Bayern: Geschichtlicher Bericht Und Gebete | Hattler, Franz. | 1880 | German | Mary |
| Das Grunddogma Des Romanismus, Oder, Die Lehre Von Der Kirche | Delitzsch, Johannes. | 1875 | German | Catholic Church |
| Das Heidentum in Der Römischen Kirche: Bilder Aus Dem Religiösen Und Sittlichen Leben Süditaliens | Trede, Th. (Theodor); b. 1833. | 1889 | German | Folklore |
| Das Indulgenz-Edict Des Römischen Bischofs Kallist | Rolffs, Ernst; b. 1867. | 1893 | German | Church discipline |
| Das Katholische Kirchenrecht | Schulte, Joh. Friedrich von; (Johann Friedrich); 1827-1914. | 1856 | German | Canon law |
| Das Konklave Pius' IV. 1559: Historische Abhandlung | Müller, Theodor; b. 1863. | 1889 | German | Popes |
| Das Konzil Zu St. Basle: Ein Beitrag Zur Lebensgeschichte Gerberts Von Aurillac | Schlockwerder, Karl Theodor. | 1906 | German | Popes |
| Das Letzte Und Das Nächste Allgemeine Concil | Fessler, Joseph; 1813-1872. | 1869 | German | Councils and synods |
| Das Papiasfragment: Exegetische Untersuchung Des Fragmentes (Eusebius, Hist. Eccl. III, 39, 3-4) Und Kritik Der Gleichnamigen Schrift Von Dr. Weiffenbach | Leimbach, Carl L. (Carl Ludwig); 1844-1905. | 1875 | German | Papias |
| Das Papstthum Im Widerspruch Mit Vernunft, Moral Und Christenthum | Fetzer, J. J. (Johann Jakob) | 1869 | German | Popes |
| Das Papstthum in Seiner Sozial-Kulturellen Wirksamkeit | Hoensbroech, Paul; Graf von; 1852-1923. | 1905 | German | Papacy |
| Das Papsttum Und Byzanz: Die Trennung Der Beiden Mächte Und Das Problem Ihrer Wiedervereinigung Bis Zum Untergange Des Byzantinischen Reichs (1453) | Norden, Walter. | 1903 | German | Papacy |
| Das Papsttum Und Seine Unfehlbaren: Geschichte Des Römischen Pontifikats | Rolf, A. | 1895 | German | Papacy |
| Das Papsttum: Seine Idee Und Ihre Träger | Krüger, Gustav; b. 1862. | 1907 | German | Papacy |
| Das Römische Concil: Vier Vorträge Im Evangelischen Verein Zu Hannover | Uhlhorn, Gerhard; 1826-1901. | 1870 | German | Councils and synods |
| Das Sakramentsproblem in Der Gegenwärtigen Dogmatik | Dunkmann, Karl; 1868-1932. | 1911 | German | Sacraments |
| Das Unfehlbare Lehramt Des Papstes Nach Der Entscheidung Des Vaticanischen Concils | Ketteler, Wilhelm Emmanuel; Freiherr von; 1811-1877. | 1871 | German | Popes |
| Das Vaticanische Dogma Von Dem Universal-Episcopat Und Der Unfehlbarkeit Des Papstes in Seinem Verhältniss Zum Neuen Testament Und Der Patristischen Exegese: Bitte Um Aufklärung an Alle Katholische Theologen | Langen, Joseph. | 1871 | German | Popes |
| Das Vaticanische Dogma Von Dem Universal-episcopat Und Der Unfehlbarkeit Des Papstes in Seinem Verhältniss Zur Exegetischen Ueberlieferung Vom Siebenten Bis Zum Dreizehnten Jahrhundert | Langen, Joseph. | 1872 | German | Popes |
| Das Vaticanum Und Bonifaz VIII: Eine Auseinandersetzung Mit Herrn Professor Berchtold | Martens, Wilhelm. | 1888 | German | Popes |
| Das Verfahren Deutscher Bischöfe Bezüglich Der Den Altkatholiken Zum Mitgebrauch Eingeräumten Kirchen: Ein Theologisches Gutachten | Reusch, F. H. (Franz Heinrich); 1825-1900. | 1875 | German | Sacrilege |
| Das Verhältnis Der Römischen Kirche Zu Den Kleinasiatischen Vor Dem Nicaenischen Konzil | Berendts, Alexander; 1863-1912. | 1898 | German | Eastern churches |
| Das Wormser Konkordat Und Sein Vorurkunden: Hinsichtlich Entstehung, Formulierung, Rechtsgültigkeit | Bernheim, Ernst; 1850-1942. | 1906 | German | Catholic Church |
| Dawn of the Catholic Revival in England, 1781-1803, The | Ward, Bernard; 1857-1920. | 1909 | English | Catholic Church |
| De Casu Apostoli, Seu, Fidei Privilegio | Vermeersch, A. (Arthur); 1858-1936. | 1911 | Latin | Marriage |
| De Codicibus Mss. Graecis PII II: In Bibliotheca Alexandrino-Vaticana Schedas | Duchesne, L. (Louis); 1843-1922. | 1880 | Greek | Manuscripts, Greek |
| De Disciplinae Arcani, Quae Dicitur, in Ecclesia Christiana Origine: Commentatio, Quam Pro Munere Professoris Publici OrdinarII in Facultate Theologica Academiae Ruperto-Carolae Rite Suscipiendo | Rothe, Richard; 1799-1867. | 1841 | Latin | Discipline of the secret |
| de Ebionitarum Origine Et Doctrina, Ab Essenis Repetenda | Baur, Ferdinand Christian; 1792-1860. | 1831 | Latin | Ebionism |
| De Ecclesia Christi: Commentariorum Libri Quinque | Passaglia, Carlo; 1812-1887. | 1853 | Latin | Church |
| De Ecclesia Christi: Praelectiones Novae in Seminario Sancti SulpitII Habitae: Cum Multis Annotationibus in Ulteriora Cujusque Studia Et Praedictionis Usus Profuturis | Brugère, Lud.-Fred. | 1878 | Latin | Catholic Church |
| De Eucharistia Tractatus Maior: Accedit Tractatus de Eucharistia Et Poenitentia Sive de Confessione | Wycliffe, John; d. 1384. | 1892 | Latin | Transubstantiation |
| De Fide: Synopsis Praelectionum, Quas in C.R. Universitate Oenipontana | Stentrup, Ferdinandus Aloisius. | 1890 | Latin | Faith |
| De Immaculato B. V. Mariae Conceptu an Dogmatico Decreto Definiri Possit: Disquisitio Theologica | Perrone, Giovanni; 1794-1876. | 1854 | Latin | Immaculate Conception |
| De Incarnatione Verbi Dei: Together With Three Essays Subsidiary to the Same | Hawkesworth, Alan S. (Alan Spencer); b. 1867. | 1897 | English | Incarnation |
| de Institutionis Theologicae Via Ac Ratione: Oratio Academica Solemnis, Quam Pro Anni Scholastici Cursu Fauste Finiendo AuspicIIs Rev. Episcopi Paderbornensis in Auditorio Almae Scholae Theodorianae Maximo | Oswald, H. | 1850 | Latin | Catholic Church |
| De Justini Martyris Scriptis Et Doctrina | Otto, J. C. T. (Johannes Carl Theodor); 1816-1897. | 1841 | Latin | Justin |
| De La Monarchie Pontificale À Propos Du Livre de Mgr. L'èvèque de Sura | Guèranger, Prosper; 1806-1875. | 1870 | French | Popes |
| De L'avenir Des Peuples Catholiques | Laveleye, Emile de; 1822-1892. | 1898 | French | Protestantism |
| De L'habitation Du Saint-esprit Dans Les Àmes Justes D'après La Doctrine de Saint Thomas D'aquin | Froget, Barthèlemy. | 1898 | French | Holy Spirit |
| De L'immaculèe Conception de La Sainte Vierge: Examen Critique Des Articles Du Journal Des Dèbats | Sisson, A. | 1854 | French | Immaculate Conception |
| de Modernismo: Tractatus Et Notae Canonicae Cum Actis S. Sedis: A 17 Aprilis 1907 Ad 25 Septembris 1910 | 1910 | Latin | Modernism | |
| De Modernistarum Doctrinis: Tractatus Philosophico-Theologicus Ad Cleri Scholarumque Penitiorem Institutionem | Carbone, Caesar. | 1909 | Latin | Modernism |
| De Orde Der Jezuieten: Hare Geschiedenis, Inrichting En Moraal | Maronier, J. H. (Jan Hendrick); 1827-1920. | 1908 | Dutch | Jesuits |
| De Prohibitione Et Censura Librorum: Dissertatio Canonico-Moralis | Vermeersch, A. (Arthur); 1858-1936. | 1906 | Latin | Prohibited books |
| De Rationibus Festorum Mobilium Utriusque Ecclesiae Occidentalis Atque Orientalis: Commentarius Usui Clericorum Accomadatus: Accedunt Breves Quaedam Animadversiones in Novam KalendarII Rationem A Cl. Maedler Propositam | Nilles, Nicolaus; 1828-1907. | 1868 | Latin | Fasts and feasts |
| De Revelatione Supernaturali | Ottiger, Ignaz. | 1897 | Latin | Revelation |
| De Sacramentis in Communi Et in Speciali | Mancini, Jerome Marie. | 1905 | Latin | Sacraments |
| De Sacramento Extremae Unctionis: Tractatus Dogmaticus | Kern, Josephus. | 1907 | Latin | Extreme unction |
| De Stabilitate Et Progressu Dogmatis | Lèpicier, Alexius Maria. | 1908 | Latin | Catholic Church |
| De Toestand Der Nederlandsche Katholieken Ten Tijde Der Republiek | Knuttel, Willem Pieter Cornelis; 1854-1921. | 1892 | Dutch | Catholics |
| De Vera Religione: Praelectiones Novae in Seminario Sancti SulpitII Habitae: Cum Multis Annotationibus in Ulteriora Cujusque Studia Et Praedicationis Usus Profuturis | Brugère, Lud.-Fred. | 1878 | Latin | Catholic Church |
| De Visitatione SS. Liminum Et Dioeceseon; Ac de Relatione S. Sedi Exhibenda: Commentarium in Decretum "a Remotissima Ecclesiae Aetate" Iussu PII X. Pont., O.M., A S. Congregatione Consistoriali Die 31 Decembris 1909 | 1912 | Latin | Visitations, Ecclesiastical (Canon law) | |
| Dealings With the Inquisition, or, Papal Rome, Her Priests, and Her Jesuits: With Important Disclosures | Achilli, Giacinto; b. 1803. | 1851 | English | Inquisition |
| Death Real and Apparent: In Relation to the Sacraments: A Physiologico-Theological Study | Ferreres, Juan B. (Juan Bautista); 1861-1936. | 1906 | English | Sacraments |
| Decay of the Church of Rome, The | McCabe, Joseph; 1867-1955. | 1909 | English | Catholic Church |
| Declarations and Letters on the Vatican Decrees, 1869-1887 | Dòllinger, Johann Joseph Ignaz von; 1799-1890. | 1891 | English | Catholics |
| Decline of Popery and Its Doctrinal Diversities: Two Discourses Delivered November 24th, and December 1st, 1850, in Reply to the Lecture of Archbishop Hughes on "the Decline of Protestantism and Its Cause", The | Hatfield, Edwin F. (Edwin Francis); 1807-1883. | 1851 | English | Catholic Church |
| Decree on Daily Communion: A Historical Sketch and Commentary, The | Ferreres, Juan B. (Juan Bautista); 1861-1936. | 1909 | English | Lord's Supper |
| Decreta ConcilII PlenarII Baltimorensis TertII: A.D. MDCCCLXXXIV | 1886 | Latin | Catholic Church | |
| Defence of the Roman Church Against Father Gratry | Guèranger, Prosper; 1806-1875. | 1870 | English | Popes |
| Degrees of the Spiritual Life: A Method of Directing Souls According to Their Progress in Virtue, The | Saudreau, Auguste; 1859-1946. | 1907 | English | Spiritual direction |
| Dei ConcilII Ecumenici: In Generale Ed in Specie: Del Concilio Ecumenico Vaticano | Coppola, Raffaele; Monsignor. | 1869 | Italian | Councils and synods |
| Della Fallibilità Dei Pontefici Nel Dominio Temporale | Muratori, Lodovico Antonio; 1672-1750. | 1872 | Italian | Popes |
| Della Storia Civile E Politica Del Papato: Dal Primo Secolo Dell'eìra Cristiana Fino All'imperatore Teodosio | Nobili-Vitelleschi, F. | 1900 | Italian | Papacy |
| Dell'immacolato Concepimento Di Maria E Della Sua Dogmatica Definizione: Dialogo Polemico Famigliare: Con Appendice Di Pie Pratiche | Finazzi, Giovanni. | 1855 | Italian | Immaculate Conception |
| Dèmonstration de L'immaculèe Conception de La Bienheureuse Vierge Marie, Mère de Dieu | Parisis, Pierre-Louis. | 1849 | French | Immaculate Conception |
| Dèmonstration Philosophique Du Catholicisme: À Tous Ceux Qui Tiennent À La Vèritè, À Leurs Semblables, À Leur Patrie | Polge; abbè; d. 1866. | 1851 | French | Catholic Church |
| Den Nordiske Kirkes: Grundlaeggelse Og Fãrste Udvikling | Jørgensen, A. D. (Adolf Ditlev); 1840-1897. | 1874 | Danish | Catholic Church |
| Der Ablass: Seine Geschichte Und Bedeutung in Der Heilsökonomie | Gröne, V. (Valentin); 1817-1882. | 1863 | German | Indulgences |
| Der Ablassstreit | Dieckhoff, A. W. (August Wilhelm); 1823-1894. | 1886 | German | Indulgences |
| Der Altkatholicismus | Bühler, Christian. | 1880 | German | Old Catholic Church |
| Der Altkatholicismus: Eine Denk-Und Schutzschrift an Das Evangelische Deutschland | Beyschlag, Willibald; 1823-1900. | 1883 | German | Old Catholic Church |
| Der Altkatholicismus: Geschichte Seiner Entwicklung, Inneren Gestaltung Und Rechtlichen Stellung in Deutschland: Aus Den Akten Und andern Authentischen Quellen | Schulte, Joh. Friedrich von; (Johann Friedrich); 1827-1914. | 1887 | German | Old Catholicism |
| Der Begriff Dogma Entwickelt Aus Der Entscheidung Über Die Unbefleckte Empfängniss Mariä | Enders, Barthol. | 1857 | German | Immaculate Conception |
| Der Beste Und Kürzeste Weg Zur Vollkommenheit | Nieremberg, Juan Eusebio; 1595-1658. | 1906 | German | Perfection |
| Der Deutsche Modernismus | Engert, Thaddaeus. | 1910 | German | Modernism |
| Der Eid Wider Den Modernismus Und Die Theologische Wissenschaft | Mausbach, Joseph; 1861-1931. | 1911 | German | Modernism |
| Der Einfluss Portugals Bei Der Wahl Pius VI. | Harder, Ernst. | 1882 | German | Popes |
| Der Gedanke Der Päpstlichen Weltherrschaft Bis Auf Bonifaz VIII | Hauck, Albert; 1845-1918. | 1904 | German | Popes |
| Der Gegensatz Des Katholicismus Und Protestantismus: Nach Den Principien Und Hauptdogmen Der Beiden Lehrbegriffe: Mit Besonderer Rücksicht Auf Herrn Dr. Möhler's Symbolik | Baur, Ferdinand Christian; 1792-1860. | 1836 | German | Protestantism |
| Der Hirt Des Hermas | Zahn, Theodor; 1838-1933. | 1868 | German | Hermas |
| Der Hl. Thomas Von Aquin Über Das Unfehlbare Lehramt Des Papstes | Leitner, Franz Xaver. | 1872 | German | Popes |
| Der Index Der Verbotenen Bücher: Ein Beitrag Zur Kirchen-Und Literaturgeschichte | Reusch, F. H. (Franz Heinrich); 1825-1900. | 1883 | German | Prohibited books |
| Der Jesuitenorden Und Der Freimaurerorden: Vortrag in Der Öffentlichen Katholikenversammlung Zu Aachen Am 5. November 1871 | Thissen, Eugen Theodor. | 1871 | German | Freemasonry |
| Der Jesuiten-Orden: Nach Seiner Verfassung Und Doctrin, Wirksamkeit Und Geschichte | Huber, Johannes; 1830-1879. | 1873 | German | Jesuits |
| Der Kampf Um Glatz: Aus Der Geschichte Der Gegenreformation in Der Grafschaft Glatz | Wiese, Hugo von; 1844-1904. | 1896 | German | Counter-Reformation |
| Der Katholicismus Als Princip Des Fortschritts | Schell, Herman; 1850-1906. | 1899 | German | Church and social problems |
| Der Katholische Modernismus | Schnitzer, Joseph; 1859-1939. | 1912 | German | Modernism |
| Der Katholizismus Und Das Zwanzigste Jahrhundert Im Lichte Der Kirchlichen Entwicklung Der Neuzeit | Ehrhard, Albert; 1862-1940. | 1902 | German | Catholic Church |
| Der Liberalismus Ist Sünde: Brennende Fragen | Sardä y Salvany, Felix; 1844-1916. | 1889 | German | Liberalism (Religion) |
| Der Mechanismus Der Vatikanischen Religion: Nach Dem Fakultätenbuch Der Redemptoristen | Friedrich, J. (Johann); 1836-1917. | 1876 | German | Monasticism and religious orders |
| Der Monat Mariä | Weninger, F. X. (Francis Xavier); 1805-1888. | 1850 | German | Mary |
| Der Neue Syllabus Pius X., Oder, Dekret Des Hi. of Fiziums `Lamentabili' Vom 3. Juli 1907 | Heiner, Franz; 1849-1919. | 1907 | German | Modernism |
| Der Palast Des Kaiphas Und Der Neue St. Petersgarten Der P.P. Assumptionisten Auf Dem Berge Sion | Coppens, Urbain. | 1905 | German | Churches |
| Der Papst Und Der Kirchenstaat | Rattinger, Daniel. | 1866 | German | Popes |
| Der Papst Und Die Wissenschaft: Mit Rücksicht Auf Die Jesuiten | Elvenich, Peter Joseph; 1796-1886. | 1875 | German | Popes |
| Der Papst, Das Oberhaupt Der Gesammtkirche: Eine Geschichtliche Studie, Zugleich Eine Festgabe Zur Achtzehnten Säcularfeier Des Glorreichen Martyriums Des Ersten Papstes | Schneemann, G. (Gerhard); 1829-1885. | 1867 | German | Popes |
| Der Papst, Der Absolutismus Und Das Concil | 1869 | German | Popes | |
| Der Priester-Spiegel, Oder, Mysterien Der Römisch-Katholischen Kirche | Ludvigh, Samuel. | 1870 | German | Gavin, Antonio |
| Der Primat Der Petrus: Eine Untersuchung | Grill, Julius; 1840-1930. | 1904 | German | Popes |
| Der Reformkatholizismus: Für Die Gebildeten Aller Bekenntnisse | Müller, Josef. | 1899 | German | Modernism |
| Der Römische Bischof Im Vierten Jahrhundert | Hackenschmidt, Karl; 1839-1915. | 1870 | German | Papacy |
| Der Simonismus Und Das Christenthum, Oder, Beurtheilende Darstellung Der Simonistischen Religion, Ihres Verhältnisses Zur Christlichen Kirche, Und Der Lage Des Christenthums in Unserer Zeit | Bretschneider, Karl Gottlieb; 1776-1848. | 1832 | German | Saint-Simonianism |
| Der Syllabus: Seine Autorität Und Tragweite | Hoensbroech, Paul; Graf von; 1852-1923. | 1904 | German | Catholic Church |
| Der Unfehlbare Papst, Oder, Die Grosse Häresie Des 19. Jahrhunderts: In Aphoristischen Bemerkungen | Waagen, Carl. | 1871 | German | Popes |
| Der Unfehlbare Papst. Erster Vortrag | Elvenich, Peter Joseph; 1796-1886. | 1874 | German | Popes |
| Der Wahre Inwendige Und Auswendige Christ. | Dieterici, Wilhelm. | 1739 | German | |
| Der Wahre Sinn Der Vatikanischen Lehrentscheidung Über Das Unfehlbare Päpstliche Lehramt | Martin, Konrad. | 1871 | German | Popes |
| Des Hochheiligen, Ökumenischen Und Allgemeinen Concils Von Trient Canones Und Beschlüsse: Nebst Den Darauf Bezüglichen Päpstlichen Bullen Und Verordnungen Und Einem Vollständigen Inhaltsverzeichnisse: In Treuer Verdeutschung Nebst | 1858 | German | ||
| Des Poèmes Latins Attribuès À Saint Bernard | Haurèau, B. (Barthèlemy); 1812-1896. | 1890 | French | Latin poetry, Medieval and modern |
| Descriptiones Terrae Sanctae Ex Saeculo VIII., IX., XII. Et XV. | 1874 | Latin | Christian pilgrims and pilgrimages | |
| Destitution and Suggested Remedies: With Preface | 1911 | English | Poor laws | |
| Deutschland Und Die Päpstliche Weltherrschaft | Hauck, Albert; 1845-1918. | 1910 | German | Popes |
| Development: Thoughts on Bishop Gore's "Roman Catholic Claims" | Rickaby, Joseph; 1845-1932. | 1905 | English | Popes |
| Developments of Roman Catholicism, The | Bain, John A. | 1908 | English | Catholic Church |
| Devil in the Church: His Secret Works Exposed and His Snares Laid to Destroy Our Public Schools: A History ofRomanism for Nineteen Hundred Years; Its Opposition to Our Public School System and Effect Upon Our People and Government: Inc, The | 1902 | English | Catholic Church | |
| Devotion to the Blessed Virgin: Being the Substance of All the Sermons for Mary's Feasts Throughout the Year | Bossuet, Jacques Bènigne; 1627-1704. | 1903 | English | Mary |
| Dialogus, Sive, Speculum Ecclesie Militantis | Wycliffe, John; d. 1384. | 1886 | Latin | Church property |
| Diary and Visitation Record of the Rt. Rev. Francis Patrick Kenrick: Administrator and Bishop of Philadelphia, 1830-1851, Later, Archbishop of Baltimore | Kenrick, Francis Patrick; 1796-1863. | 1916 | English | Kenrick, Francis Patrick |
| Diary of an Exiled Nun, The | Exiled nun. | 1910 | English | Nuns |
| Dictionnaire Des Ouvrages Anonymes Et Pseudonymes Publiès Par Des Religieux de La Compagnie de Jèsus: Depuis Sa Fondation Jusqu'à Nos Jours | Sommervogel, Carlos; 1834-1902. | 1884 | French | Anonyms and pseudonyms |
| Die "Irrthümer" Von Mehr Als Vierhundert Bischöfen Und Ihr Theologischer Censor: Ein Beitrag Zur Würdigung Der Von Herrn Dr. Von Döllinger Veröffentlichten "Worte Über Die Unfehlbarkeitsadresse" | Hergenröther, Joseph; 1824-1890. | 1870 | German | Popes |
| Die Akten Der Edessenischen Bekenner Gurjas, Samonas Und Abibos | 1911 | German | Christian martyrs | |
| Die Ältesten Römischen Sacramentarien Und Ordines | Probst, Ferdinand; 1816-1899. | 1892 | German | Sacramentaries |
| Die Altkatholische Kirche Des Erzbisthums Utrecht: Geschichtliche Parallele Zur Altkatholischen Gemeindebildung in Deutschland | Nippold, Friedrich. | 1872 | German | Old Catholic Church |
| Die Anfänge Der Gegenreformation in Den Niederlanden | Kalkoff, Paul; 1858-1928. | 1903 | German | Counter-Reformation |
| Die Anfänge Des Katholischen Christentums Und Des Islams: Eine Religionsgeschichtliche Untersuchung | Bestmann, H. J. (Hugo Johannes) | 1884 | German | Christianity and other religions |
| Die Apostolische Vollmacht Des Papstes in Glaubens-Entscheidungen | Weninger, F. X. (Francis Xavier); 1805-1888. | 1841 | German | Popes |
| Die Apostolischen Konstitutionen: Eine Litterar-Historische Untersuchung | Funk, F. X. von; (Franz Xaver); 1840-1907. | 1891 | German | Church orders, Ancient |
| Die Arbeiten Des Vatikanischen Concils | Martin, Konrad. | 1873 | German | Vatican Council |
| Die Aufhebung Des Jesuiten-Ordens: Eine Beleuchtung Der Alten Und Neuen Anklagen Wider Denselben | Riffel, Caspar; 1807-1856. | 1845 | German | Jesuits |
| Die Avignonesischen Päpste, Ihre Machtfülle Und Ihr Untergang: Vortrag | Höfler, Karl Adolf Constantin; Ritter von; 1811-1897. | 1871 | German | Papacy |
| Die Bullen Der Päpste: Bis Zum Ende Des Zwölften Jahrhunderts | Pflugk-Harttung, Julius von; 1848-1919. | 1901 | German | Bulls, Papal |
| Die Bussbücher Und Das Kanonische Bussverfahren | Schmitz, Herm. Jos. (Hermann Joseph); 1841-1899. | 1898 | German | Penance |
| Die Bussbücher Und Die Bussdisciplin Der Kirche | Schmitz, Herm. Jos. (Hermann Joseph); 1841-1899. | 1883 | German | Penitentials |
| Die Bussdisciplin Der Kirche Von Den Apostelzeiten Bis Zum Siebenten Jahrhundert | Frank, Friedrich; 1832-1904. | 1867 | German | Penance |
| Die Busse, Die Letzte Oelung, Die Priesterweihe Und Die Ehe | Oswald, J. H. (Johann Heinrich); 1817-1903. | 1864 | German | Sacraments |
| Die Canones Hippolyti | Achelis, Hans; 1865-1937. | 1891 | German | Church orders, Ancient |
| Die Christenkatastrophe Unter Nero: Nach Ihren Quellen, Insbesondere Nach Tac. Ann. XV, 44 | Klette, E. Theodor; (Emil Theodor) | 1907 | German | Persecution |
| Die Christenverfolgungen Der Cäsaren Bis Zum Dritten Jahrhundert | Wieseler, Karl; 1813-1883. | 1878 | German | Persecution |
| Die Christenverfolgungen Im Römischen Reiche: Vom Standpunkte Des Juristen | Cohn, Max Conrat; 1848-1911. | 1897 | German | Persecution |
| Die Christliche Familie: Im Kampfe Gegen Feindliche Mächte: Vorträge Über Christliche Ehe Und Erziehung | Hug, Gall Jos. (Gall Joseph); 1836-1916. | 1896 | German | Family |
| Die Constitution Unigenitus: Ihre Veranlassung Und Ihre Folgen: Ein Beitrag Zur Geschichte Des Jansenismus | Schill, Andreas. | 1876 | German | Jansenists |
| Die Davidische Abkunft Der Mutter Jesu. I. Teildie Ausserbiblischen Nachrichten | Fischer, Joseph; b. 1874. | 1910 | German | Mary |
| Die Deutschen Bishöfe Und Der Aberglaube: Eine Denkschrift | Reusch, F. H. (Franz Heinrich); 1825-1900. | 1879 | German | Catholic Church |
| Die Deutschen Päpste: Nach Handschriftlichen Und Gedruckten Quellen | Höfler, Karl Adolf Constantin; Ritter von; 1811-1897. | 1839 | German | Papacy |
| Die Didache | 1907 | Greek | Church orders, Ancient | |
| Die Didache Des Judentums Und Der Urchristenheit | Seeberg, Alfred; 1863-1915. | 1908 | German | Church polity |
| Die Diöcesansynode | Phillips, George; 1804-1872. | 1849 | German | Councils and synods, Diocesan (Canon law) |
| Die Drei Ältesten Martyrologien | Lietzmann, Hans; 1875-1942. | 1903 | German | Martyrologies |
| Die Entstehung Der Kindertaufe Im Dritten Jahrhundert N. Chr. Und Die Wiedereinführung Der Biblischen Taufe Im Siebzehnten Jahrhundert N. Chr: Der Kirchen-Und Weltgeschichte Gemäss | Rauschenbusch, August; 1816-1899. | 1898 | German | Infant baptism |
| Die Entstehung Der Konziliaren Theorie: Zur Geschichte Des Schismas Und Der Kirchenpolitischen Schriftsteller Konrad Von Gelnhausen (1390) Und Heinrich Von Langenstein (1397) | Kneer, August. | 1893 | German | Schism, The Great Western, 1378-1417 |
| Die Entstehung Der Speisesakramente | Reuterskiöld, Edgar; 1872-1932. | 1912 | German | Sacraments |
| Die Entwickelung Der Katholischen Kirche Im Neunzehnten Jahrhundert: Vorträge | Sell, Karl. | 1898 | German | Catholic Church |
| Die Frömmigkeit Philos Und Ihre Bedeutung Für Das Christentum: Eine Religionsgeschichtliche Studie | Windisch, Hans; 1881-1935. | 1909 | German | Piety |
| Die Fundamentale Glaubenslehre Der Katholischen Kirche | 1903 | German | Catholic Church | |
| Die Gegenreformation in Schlesien | Ziegler, Heinrich; 1841-1913. | 1888 | German | Counter-Reformation |
| Die Gegner "Edgars": Und Ihre Leistungen | Hammerstein, L. von; (Ludwig); 1832-1905. | 1887 | German | Hammerstein, L. von |
| Die Geheimen Gesellschaften Mit Vollem Rechte Verurtheilt Von Der Katholischen Kirche | Becker, Wilhelm. | 1800 | German | Secret societies |
| Die Geistlichen Übungen Des Ignatius Von Loyola: Eine Psychologische Studie | Holl, Karl; 1866-1926. | 1905 | German | Ignatius |
| Die Geleise Des Kirchenjahres Und Der Wege Gottes in Der Gründung Seines Reiches Auf Erden: In Der Anordnung Und Dem Zusammenhange Der Sonn-Und Festtäglichen Evangelien (De Tempore) | Seiss, Martin. | 1875 | German | Church year meditations |
| Die Geltenden Papstwahlgesetze | 1912 | Latin | Popes | |
| Die Geschäfts-Ordnung Des Concils Von Trient: Aus Einer Handschrift Des Vaticanischen Archives Zum Erstenmale Genau Und Vollständig An's Licht Gestellt: Sammt Einem Vorberichte. | 1871 | German | Council of Trent | |
| Die Geschichte Des Bisthums Bamberg | Looshorn, Johann; 1831-1916. | 1886 | German | Henry |
| Die Gottheit Des Heiligen Geistes: Nach Den Griechischen Vätern Des Vierten Jahrhunderts: Eine Dogmengeschichtliche Studie | Schermann, Theodor; 1878-1922. | 1901 | German | Holy Spirit |
| Die Grossen Socialen Fragen Der Gegenwart: Sechs Predigten | Ketteler, Wilhelm Emmanuel; Freiherr von; 1811-1877. | 1878 | German | Church and social problems |
| Die Grundirrthümer Unserer Zeit | Roh, Peter. | 1890 | German | Modernism |
| Die Höchste Lehrgewalt Des Papstes | Guèranger, Prosper; 1806-1875. | 1870 | German | Popes |
| Die Infallibilität Des Oberhauptes Der Kirche Und Die Zustimmungsadressen an Herrn V. Döllinger, Namentlich Die Münster'sche | Stöckl, Albert; 1823-1895. | 1870 | German | Popes |
| Die Irrthümer Über Die Ehe | Schneemann, G. (Gerhard); 1829-1885. | 1866 | German | Marriage |
| Die Kanones Der Wichtigsten Altkirchlichen Concilien: Nebst Den Apostolischen Kanones | 1896 | Greek | Canon law | |
| Die Katholische Kirche in Den Vereinigten Staaten Nordamerikas: In Vier Abschnitten | Hammer, Bonaventure; 1842-1917. | 1897 | German | Catholic Church |
| Die Katholische Kirche in Den Vereinigten Staaten Von Nordamerika | 1864 | German | Christian martyrs | |
| Die Katholische Kritik Über Mein Werk, "Das Papstthum in Seiner Sozial-Kulturellen Wirksamkeit": Ein Beitrag Zur Charakteristik Des Ultramontanismus | Hoensbroech, Paul; Graf von; 1852-1923. | 1902 | German | Papacy |
| Die Katholischen Missionen in Indien, China Und Japan: Ihre Organisation Und Das Portugiesische Patronat Vom 15. Bis Ins 18. Jahrhundert | Jann, Adelhelm; 1876-1945. | 1915 | German | Catholic Church |
| Die Katholisch-Ttheologische Fakultät Zu Marburg: Ein Beitrag Zur Geschichte Der Katholischen Kirche in Kurhessen Und Nassau | Mirbt, Carl. | 1905 | German | Theology |
| Die Kirche Gottes Und Die Bischöfe: Denkschrift Mit Rücksicht Auf Das Angekündigte Allgemeine Concilium Zur Klärung Der Religiösen Lebensfrage | Liaño, Heinrich St. A. von. | 1869 | German | Catholic Church |
| Die Kirchengeschichte Von Spanien | Gams, Pius Bonifatius; 1816-1892. | 1862 | German | Catholic Church |
| Die Kirchliche Gewalt Und Ihre Träger | Schneemann, G. (Gerhard); 1829-1885. | 1867 | German | Church |
| Die Kirchlichen Zustände in Oesterreich Und Das Allgemeine Konzil in Rom | Schöpf, Ignaz. | 1869 | German | Catholic Church |
| Die Lehre Der Zwölf Apostel: Nebst Untersuchungen Zur Ältesten Geschichte Der Kirchenverfassung Und Des Kirchenrechts | Harnack, Adolf von; 1851-1930. | 1884 | German | Church orders, Ancient |
| Die Lehre Von Den Sakramenten in Ihrer Geschichtlichen Entwickelung Innerhalb Der Abendländischen Kirche Bis Zum Concil Vom Trient | Hahn, G. Ludwig; (Georg Ludwig); 1823-1903. | 1864 | German | Sacraments |
| Die Lehre Von Der Eucharistie in Den Drei Ersten Jahrhunderten: Historisch-Theologische Abhandlung | Döllinger, Johann Joseph Ignaz von; 1799-1890. | 1826 | German | Lord's Supper |
| Die Lehre Von Der Unfehlbarkeit Des Papstes Aus Der Geschichte | Daniel, J. fl. 19th century. | 1870 | German | Popes |
| Die Lehre Von Der Wirksamkeit Der Sakramente Ex Opere Operato: In Ihrer Entwicklung Innerhalb Der Scholastik Und Ihrer Bedeutung Für Die Christliche Heilslehre | Schäzler, Constantin; Freiherr von; 1827-1880. | 1860 | German | Sacraments |
| Die Los Von Rom-Bewegung in Frankreich | Rèveillaud, Eug. (Eugène); b. 1851. | 1900 | German | Protestants |
| Die Macht Der Römischen Päpste: Über Fürsten, Länder, Völker Und Individuen: Nach Ihren Lehren Und Handlungen Seit Gregor VII. Zur Würdigung Ihrer Unfehlbarkeit | Schulte, Joh. Friedrich von; (Johann Friedrich); 1827-1914. | 1896 | German | Popes |
| Die Moderne Irrlehre, Oder, Der Liberalismus Und Seine Verzweigungen Im Lichte Der Offenbarung | Riess, Florian. | 1866 | German | Liberalism (Religion) |
| Die Mutter Gottes: Geschildert Von Den Hl. Vätern Und Lehrern Der Kirche: Mit Einem Anhange Wunderbarer Erzählungen | Mislei; P. | 1866 | German | Mary |
| Die Mystische Theologie Makarius Des Aegypters: Und Die Ältesten Ansätze Christlicher Mystik | Stoffels, Joseph; b. 1879. | 1908 | German | Mysticism |
| Die Neronische Christenverfolgung: Eine Kritische Untersuchung Zur Geschichte Der Ältesten Kirche | Arnold, C. Franklin; (Carl Franklin); 1853-1927. | 1888 | German | Persecution |
| Die Neue Zeit Und Der Alte Glaube: Eine Culturgeschichtliche Studie | Schell, Herman; 1850-1906. | 1898 | German | Catholic Church |
| Die Neueren Katholischen Orden Und Congregationen Besonders in Deutschland | Schulte, Joh. Friedrich von; (Johann Friedrich); 1827-1914. | 1872 | German | Catholic Church |
| Die Neuesten Päpstlichen Dekrete | Vigilius. | 1910 | German | Catholic Church |
| Die Palästinischen Märtyrer Des Eusebius Von Cäsarea: Ihre Ausführlichere Fassung Und Deren Verhältnis Zur Kürzeren | Eusebius; of Caesarea, Bishop of Caesarea; ca. 260-ca. 340. | 1896 | German | Christian martyrs |
| Die Papst-Fabeln Des Mittelalters: Ein Beitrag Zur Kirchengeschichte | Döllinger, Johann Joseph Ignaz von; 1799-1890. | 1890 | German | Popes |
| Die Päpstliche Unfehlbarkeit Und Das Vatikanische Koncil: Vortrag | Hinschius, Paul. | 1871 | German | Popes |
| Die Papstverzeichnisse Des Eusebios Und Der Von Ihm Abhängigen Chronisten | Lipsius, Richard Adelbert; 1830-1892. | 1868 | German | Papacy |
| Die Papstwahl Innocenz XIII | Mayer, Max; Ritter von. | 1874 | German | Popes |
| Die Papstwahlen Unter Den Karolingern | Heimbucher, Max; b. 1859. | 1889 | German | Popes |
| Die Propaganda: Ihre Provinzen Und Ihr Recht: Mit Besonderer Rücksicht Auf Deutschland | Mejer, Otto; 1818-1892. | 1852 | German | Catholic Church |
| Die Quellen Zur Geschichte Der Entstehung Des Kirchenstaates | Haller, Johannes; 1865-1947. | 1907 | German | Papal States |
| Die Quellen Zur Geschichte Des Konzils Von Cividale 1409 | Schmitz, L. | 1894 | German | Catholic Church |
| Die Römische Curie: Ihre Gegenwärtige Zusammensetzung Und Ihr Geschäftsgang: Nach Mehrjähriger Eigener Anschauung | Bangen, Joh. Heinr. (Johann Heinrich); 1823-1865. | 1854 | German | Catholic Church |
| Die Römischen Päpste in Den Letzten Vier Jahrhunderten | Ranke, Leopold von; 1795-1886. | 1878 | German | Papacy |
| Die Römisch-Katholische Kirche Im Königreich Der Niederlande: Ihre Geschichtliche Entwickelung Seit Der Reformation Und Ihr Gegenwärtiger Zustand: Mit Einem Sendschreiben an Dr. C.E. Van Koetsveld Im Haag Über Die Internationale Bede | Nippold, Friedrich. | 1877 | German | Catholic Church |
| Die Ruthenisch-Römische Kirchenvereinigung Genannt Union Zu Brest | Likowski, Eduard. | 1904 | German | Catholic Church |
| Die Schönheit Der Katholischen Kirche | Rippel, Gregorius; 1681-1729. | 1906 | German | Church year |
| Die Studienordnung Der Gesellschaft Jesu: Mit Einer Einleitung | 1896 | German | Jesuits | |
| Die Sünden Der Päpste Im Spiegel Der Geschichte: Eine Modernisten-Antwort Auf Die Borromaeus-Enzyklika | Engert, Thaddaeus. | 1910 | German | Papacy |
| Die Syrische Didaskalia | 1904 | German | Church orders, Ancient | |
| Die Syrischen Kanones Der Synoden Von Nicaea Bis Chalcedon: Nebst Einigen Zugehòrigen Dokumenten | 1908 | Syriac | Councils and synods, Ecumenical | |
| Die Territoriale Politik Der Päpste Von 500 Bis 800: Mit Besonderer Berücksichtigung Der Römischen Beamtenverhältnisse | Armbrust, L. | 1885 | German | Popes |
| Die Thatsächliche Einführung Des Bekenntnisslosen Protestantismus in Die Katholische Kirche | Ketteler, Wilhelm Emmanuel; Freiherr von; 1811-1877. | 1877 | German | Old Catholic Church |
| Die Theologie Des Heiligen Ignatius: Des Apostelschülers Und Bischofs Von Antiochien | Nirschl, Joseph; 1823-1904. | 1880 | German | Ignatius |
| Die Todestage Der Apostel Paulus Und Petrus Und Ihre Römischen Denkmäler | Erbes, C. (Carl); b. 1853. | 1899 | German | Apostles |
| Die Unbefleckte Empfängniss Der Seligsten Jungfrau Maria: Eine Dogmatische Abhandlung, Zunächst Für Gebildete Katholiken | Ginal, J. R. | 1856 | German | Immaculate Conception |
| Die Unfehlbarkeit Des Papstes Als Lehrer Der Kirche: Und Dessen Beziehung Zu Einem Allgemeinen Concilium | Weninger, F. X. (Francis Xavier); 1805-1888. | 1869 | German | Popes |
| Die Unfehlbarkeit Des Papstes Und Das Allgemeine Concil | Dechamps, Victor Auguste; 1810-1883. | 1869 | German | Popes |
| Die Unfehlbarkeit Des Papstes Und Die Münchener "Erwägungen" | Wieser, J. E. | 1870 | German | Popes |
| Die Unfehlbarkeit Des Papstes Und Die Stellung Der in Deutschland Verbreiteten Theologischen Lehrbücher Zu Dieser Lehre | 1870 | German | Popes | |
| Die Unfehlbarkeit Des Papstes: Im Lichte Der Katholischen Wahrheit Und Der Humbug, Den Die Neueste Vertheidigung Damit Treibt | Michelis, Friedrich; 1815-1886. | 1869 | German | Popes |
| Die Unfehlbarkeit Des Papstes: Im Widerspruche Mit Der 1800 Jährigen Erfahrung Der Kirche, Der Vernunft and Dem Sittlichen Gefühle Des Menschen | Kath. Geistliche. | 1870 | German | Popes |
| Die Unwahrheiten Der Römischen Briefe Vom Concil in Der Allgemeinen Zeitung | Ketteler, Wilhelm Emmanuel; Freiherr von; 1811-1877. | 1870 | German | Popes |
| Die Vaterunser-Erklärung Des Theophilus Von Antiochien: Eine Quellenuntersuchung Zu Den Vaterunser-Erklärung Des Tertullian, Cyprian, Chromatius Und Hieronymus | Loeschcke, Gerhard; 1880-1912. | 1908 | German | Theophilus |
| Die Verblendung Ketteler's Und Der Gewissenskampf Deutscher Katholiken Gegen Rom: Antwort Auf Den Culturkampf Gegen Die Katholische Kirche Und Die Neuen Kirchengesetze Für Hessen | Michelis, Friedrich; 1815-1886. | 1875 | German | Kulturkampf |
| Die Völkerrechtliche Stellung Des Papstes | Geffcken, F. Heinrich; (Friedrich Heinrich); 1830-1896. | 1885 | German | Papacy (International law) |
| Die Vulgata Sixtina Von 1590 Und Ihre Einführungsbulle | Baumgarten, Paul Maria; 1860- | 1911 | German | Catholic Church |
| Die Wahl Alexander III. Und Victor Iv. (1159): Ein Beitrag Zur Geschichte Der Kirchenspaltung Unter Kaiser Friedrich I. | Meyer, Moritz. | 1871 | German | Popes |
| Die Wahl Gregors VII. | Mirbt, Carl. | 1892 | German | Popes |
| Die Wahl Pius' V. Zum Papste | Hilliger, Benno; b. 1863. | 1891 | German | Popes |
| Die Wahren Hindernisse Und Die Grundbedingungen Einer Durchgreifenden Reform Der Katholischen Kirche Zunächst in Deutschland | Pichler, A. (Aloys); 1833-1874. | 1870 | German | Popes |
| Die Wiedervereinigung Der Morgen-Und Abendländischen Kirche: Ein Rückblick Auf Den Münchener Altkatholiken-Congress, Und Ein Vorblick Auf Die Zu Lösende Aufgabe: Offener Brief an Den Grafen Dmitry Tolstoy | Overbeck, J. J. (Julian Joseph); 1821-1905. | 1873 | German | Old Catholic Church |
| Die Wirkungen Des Geistes Und Die Geister Im Nachapostolischen Zeitalter Bis Auf Irenäus | Weinel, Heinrich; 1874-1936. | 1899 | German | Holy Spirit |
| Die Wunder Von Lourdes | Weninger, Alexander. | 1881 | German | Mary |
| Diocese of St. Paul: The Golden Jubilee, 1851-1901., The | 1901 | English | Catholic Church | |
| Discorsi Sul Culto Di Maria Ssma | Passaglia, Carlo; 1812-1887. | 1858 | Italian | Mary |
| Discourses on Various Occasions | Hyacinthe; père; 1827-1912. | 1869 | English | Old Catholicism |
| Discussion Sur Les Sept Conciles Oecumèniques: Ètudiès Au Point de Vue Traditionnel Et Libèral | Michaud, E. (Eugène); 1839-1917. | 1878 | French | Councils and synods, Ecumenical |
| Disputationes Tridentinae | Lainez, Diego; 1512-1565. | 1886 | Latin | Council of Trent |
| Distinguished Converts to Rome in America | Scannell-O'Neill, D. J. (Denis James); b. 1877. | 1907 | English | Catholic converts |
| Distinguo: Mängel Und Übelstände Im Heutigen Katholizismus Nach Professor Dr. Schell in Würzburg Und Dessen Vorschläge Zu Ihrer Heilung: Ein Wort Zur Verständigung | Braun, Carl; 1841-1909. | 1897 | German | Schell, Herman |
| Divine Office: Considered From a Devotional Point of View, The | Bacuez; abbè; (Nicolas); 1820-1892. | 1885 | English | Divine office |
| Divine Rule of Faith and Practice, or, A Defence of the Catholic Doctrine That Holy Scripture Has Been, Sincethe Times of the Apostles, the Sole Divine Rule of Faith and Practice to the Church, The | Goode, William; 1801-1868. | 1853 | English | Oxford Movement |
| Divinitas Scriptuarum: Adversus Hodiernas Novitates Asserta Et Vindicata | Schiffini, Sancto; 1841-1906. | 1905 | Latin | Catholic Church |
| Doctrina Capreoli de Influxu Dei in Actus Voluntatis Humanae: Secundum Principia Thomismi Et Molinismi Collata | Ude, Ioanne; b. 1874. | 1905 | Latin | Molinism |
| Doctrinal Decrees and Canons of the Council of Trent, The | 1854 | English | Brownlee, W. C | |
| Doctrine Chrètienne En Forme de Lectures de Piètè: Ouì L'on Expose Les Preuves de La Religion, Les Dogmes de La Foi, Les Règles de La Morale, Ce Qui Concerne Les Sacrements Et La Prière: A L'usage Des Maisons D'èducation Et Des | Lhomond; 1727-1794. | 1868 | French | Catholic Church |
| Doctrine of Modernism and Its Refutation, The | Godrycz, J. (John A.); 1873-1923. | 1908 | English | Modernism |
| Doctrine Spirituelle de Saint Augustin | Martin, J. (Jules); b. 1844. | 1901 | French | Christian life |
| Doctrines and Practices of the Church of Rome Truly Represented: In Answer to a Book Entitled "a Papist Misrepresented and Represented", The | Stillingfleet, Edward; 1635-1699. | 1851 | English | Gother, John |
| Documenta Ad Illustrandum Concilium Vaticanum Anni 1870 | 1871 | Latin | Catholic Church | |
| Documents Inèdits Pour Servir À L'histoire Ecclèsiastique de La Belgique | 1894 | French | Monasticism and religious orders | |
| Dogma Und Schulmeinung: Denkschrift in Sachen Der Sogenannten "Erhebung" Von Lehransichten Zu "Neuen Glaubenswahrheiten" | Liaño, Heinrich St. A. von. | 1869 | German | Immaculate Conception |
| Dogmengeschichte Der Katholischen Kirche | Zobl, Johann. | 1865 | German | Catholic Church |
| Doktor Döllinger Und Die Petition Der Bischöfe An's Concil | 1870 | German | Popes | |
| Dominican Revival in the Nineteenth Century: Being Some Account of the Restoration of the Order of Preachers Throughout the World Under Fr. Jandel the Seventy-Third Master-General, The | Devas, Raymund P. 1886- | 1913 | English | Jandel, Alexandre Vincent |
| Double Doctrine of the Church of Rome, The | Zedtwitz, Mary Elizabeth Caldwell; Baroness von. | 1906 | English | Catholic Church |
| Dr. A. Neander's Katholicismus Und Protestantismus | Neander, August; 1789-1850. | 1863 | German | Protestantism |
| Dr. J. J. I. Von Dòllinger's Fables Respecting the Popes in the Middle Ages | Dòllinger, Johann Joseph Ignaz von; 1799-1890. | 1872 | English | Popes |
| Dr. Johann Eck, Professor Der Theologie an Der Universität Ingolstadt: Eine Monographie | Wiedemann, Theodor; 1823-1901. | 1865 | German | Catholics |
| Dr. Middleton's Letter From Rome, Showing an Exact Conformity Between Popery and Paganism, or, The Religion of the Present Romans Derived From That of Their Heathen Ancestors: With the Author's Defence Against a Roman Catholic Opponent | Middleton, Conyers; 1683-1750. | 1854 | English | Catholic Church |
| Du Concile Gènèral Et de La Paix Religieuse. Première Partie; la Constitution de L'eglise Et La Pèriodicitè Des Conciles Gènèraux: Mèmoire Soumis Au Prochain Concile Oecumènique Du Vatican | Maret, Henri-Louis-Charles; 1805-1884. | 1869 | French | Conciliar theory |
| Du Dynamisme: Considèrè En Lui-meìme Et Dans Ses Rapports Avec La Sainte Eucharistie | Ubaghs, G. C. (Gèrard Casimir); 1800-1875. | 1852 | French | Lord's Supper |
| Du Protestantisme Au Catholicisme: John-Henry Newman, 1801-1845: Notes Psychologiques | Gout, Raoul. | 1906 | French | Newman, John Henry |
| Du Renouveau Catholique Et Des Dispositions Que Les Protestants Doivent Avoir Devant Lui | Sabatier, Paul; 1858-1928. | 1908 | French | Modernism |
| Durandus on the Sacred Vestments: An English Rendering of the Third Book of the Rationale Divinorum Officiorum of Durandus, Bishop of Mende, A.D. 1287 | Durand, Guillaume; ca. 1230-1296. | 1899 | English | Church vestments |
| Early Christian Martyrs and Their Persecutions, The | Herkless, John; Sir; 1855-1920. | 1904 | English | Christian martyrs |
| Early Church in the Light of the Monuments: A Study in Christian Archaeology, The | Barnes, Arthur Stapylton; 1861-1936. | 1913 | English | Christian antiquities |
| Early Drawings and Illuminations: An Introduction to the Study of Illustrated Manuscripts: With a Dictionary of Subjects in the British Museum | Birch, Walter de Gray; 1842-1924. | 1879 | English | Illumination of books and manuscripts |
| Early Eucharist (A.D. 30-180), The | Frankland, William Barrett; 1875- | 1902 | English | Lord's Supper |
| Early Persecutions of the Christians, The | Canfield, Leon Hardy; b. 1886. | 1913 | English | Persecution |
| Early Religious History of Maryland: Maryland Not a Roman Catholic Colony: Religious Toleration Not an Act of Roman Catholic Legislation: Being the Substance of a Lecture | Brown, B. F. (Benjamin F.) | 1876 | English | Religious toleration |
| Early Roman Episcopate to A.D. 384, The | Beet, William Ernest; b. 1869. | 1913 | English | Papacy |
| Early Roman-Catholic Missions to India: With Sketches of Jesuitism, Hindu Philosophy, and the Christianity of the Ancient Indo-Syrian Church of Malabar: An Historical Essay | Tinling, James Forbes Bisset. | 1871 | English | Catholic Church |
| Ecclesiastical Antiquities of London and Its Suburbs | Wood, Alexander; M.A., Oxon. | 1874 | English | Catholic Church |
| Ecclesiastical Curiosities | 1899 | English | Christian antiquities | |
| Ecclesiastical History of Newfoundland | Howley, M. F. (Michael Francis); 1843-1914. | 1888 | English | Catholic Church |
| Edgar, Oder, Vom Atheismus Zur Vollen Wahrheit | Hammerstein, L. von; (Ludwig); 1832-1905. | 1886 | German | Catholic Church |
| Education and the Future of Religion: A Sermon Preached in the Church of the Gesuì, Rome, March 21, 1900, for the Benefit of a Free Night School | Spalding, John Lancaster; 1840-1916. | 1900 | English | Catholic Church |
| Eid Gegen Den Modernismus: Gutachten Über Den Durch Das Päpstliche Motu Proprio "Sacrorum Antistitum" Vom 1. September 1910 Für Den Katholischen Klerus Vorgeschriebenen | Kiefl, Franz Xaver; 1869-1928. | 1912 | German | Modernism |
| Eighth of December, MDCCCLIV: Some Account of the Definition of the Immaculate Conception of the Most BlessedMother of God, The | 1855 | English | Immaculate Conception | |
| Ein Bischofsbrief Vom Concil Und Eine Deutsche Antwort: Ein Beitrag Zur Unterscheidung Von Katholicismus Und Jesuitismus | Protestantischer Christen. | 1870 | German | Jesuits |
| Ein Martyrologium Der Christlichen Gemeinde Zu Rom Am Anfang Des V. Jahrhunderts: Quellenstudien Zur Geschichte Der Römischen Märtyrer | Urbain, August. | 1901 | German | Martyrologies |
| Eine Katholische Antwort Auf Die Päpstliche Encyklika Vom 5. Februar | Michelis, Friedrich; 1815-1886. | 1875 | German | Popes |
| Eine Vorfrage Über Die Verpflichtung | Riess, Florian. | 1866 | German | |
| Eleanor Leslie: A Memoir | Stone, J. M. (Jean Mary) | 1898 | English | Catholics |
| Elèments D'archèologie Chrètienne | Marucchi, Orazio; 1862-1931. | 1899 | English | Christian antiquities |
| Elf Sendschreiben an Den Heiligen Vater in Rom | Wieczorek, Rudolph. | 1870 | German | Papacy |
| Elucubratio de Dogmatica Romani Pontificis Infallibilitate Eiusque Definibilitate | Cardoni, Giuseppe; 1802-1873. | 1870 | Latin | Popes |
| Enchiridion Symbolorum Et Definitionum: Quae in Rebus Fidei Et Morum A ConcilIIs Oecumenicis Et Summis Pontificibus Emanarunt in Auditorum Usum | 1854 | Latin | Bulls, Papal | |
| Encyclical and Modernist Theology, The | Lebreton, J. | 1908 | English | Modernism |
| Encyclical Letter of Pope Pius IX. on the Immaculate Conception, The | 1849 | English | Immaculate Conception | |
| Encyclical on "Modernism", The | Smith, Sydney F. (Sydney Fenn) | 1907 | English | Modernism |
| Encyklika Und Syllabus Vom 8. Dezember 1864: Als Ein Beitrag Zum Verständnis Der Kirchlichen Lage Der Gegenwart Für Evangelische Christen | Rönneke, K. | 1891 | German | |
| End of Controversy Controverted: A Refutation of Milner's "End of Controversy," in a Series of Letters Addressed to the Most Reverend Francis Patrick Kenrick, Roman Catholic Archbishop of Baltimore, The | Hopkins, John Henry; 1792-1868. | 1855 | English | Milner, John |
| Enea Silvio De' Piccolomini, Als Papst Pius Der Zweite: Und Sein Zeitalter | Voigt, Georg; 1827-1891. | 1856 | German | Papacy |
| England and Rome: Three Letters to a Pervert | Burgon, John William; 1813-1888. | 1869 | English | Catholic Church |
| England's Danger | Horton, Robert F. (Robert Forman); 1855-1934. | 1899 | English | Catholic Church |
| English Black Monks of St. Benedict: A Sketch of Their History From the Coming of St. Augustine to the PresentDay, The | Taunton, Ethelred L. (Ethelred Luke); 1857-1907. | 1897 | English | Monasticism and religious orders |
| English Catholic Nonjurors of 1715: Being a Summary of the Register of Their Estates, With Genealogical and Other Notes, and an Appendix of Unpublished Documents in the Public Record Office, The | 1900 | English | Catholics | |
| English Catholic Revival in the Nineteenth Century, The | Thureau-Dangin, Paul; 1837-1913. | 1900 | English | Oxford Movement |
| English Monastic Life | Gasquet, Francis Aidan; Cardinal; 1846-1929. | 1904 | English | Monasticism and religious orders |
| Enthusiasts of Port-Royal, The | Rea, Lilian. | 1912 | English | Jansenists |
| Entretiens D'un Mois de Marie | 1856 | French | Mary | |
| Episcopal Succession in England, Scotland and Ireland, A.D. 1400 to 1875: With Appointments to Monasteries andExtracts From Consistorial Acts Taken From Mss. in Public and Private Libraries in Rome, Florence, Bologna, Ravenna and Paris, The | Brady, W. Maziere; (William Maziere); 1825-1894. | 1876 | English | Catholic Church |
| Epistle of Psenosiris: An Original Document From the Diocletian Persecution (Papyrus 713 Brit. Mus.), The | Psenosiris; Presbyter. | 1902 | English | Persecution |
| Epitaphs of the Catacombs, or, Christian Inscriptions in Rome During the First Four Centuries | Northcote, J. Spencer; (James Spencer); 1821-1907. | 1878 | English | Inscriptions, Christian |
| Epitome Pastoralis Ad Usum Cleri in Statibus Foederatis Americae | Weninger, F. X. (Francis Xavier); 1805-1888. | 1855 | Latin | Catholic Church |
| Erinnerungen Eines Alten Lutheraners | Hammerstein, L. von; (Ludwig); 1832-1905. | 1882 | German | Catholics |
| Erklärung Döllingers | Döllinger, Johann Joseph Ignaz von; 1799-1890. | 1871 | German | Popes |
| Erwägungen Für Die Bischöfe Des Concilium's Über Die Frage Der Päpstlichen Unfehlbarkeit | Döllinger, Johann Joseph Ignaz von; 1799-1890. | 1869 | German | Popes |
| Essai Sur La Polèmique Et La Philosophie de Saint Clèment D'alexandrie | Hèbert-Duperron, V. (Victor); b. 1819. | 1855 | French | Clement |
| Essai Sur La Vie Et La Doctrine de Saint-Martin, Le Philosophe Inconnu | Caro, E. (Elme); 1826-1887. | 1852 | French | Saint-Martin, Louis Claude de |
| Essay on Catholicism, Liberalism and Socialism: Considered in Their Fundamental Principles | Donoso Cortès, Juan; marquès de Valdegamas; 1809-1853. | 1862 | English | Catholic Church |
| Essay on Indifference in Matters of Religion | Lamennais, Fèlicitè Robert de; 1782-1854. | 1895 | French | Rationalism |
| Essays | Ryder, Henry Ignatius Dudley; 1837-1907. | 1911 | English | Catholic Church |
| Essays and Reviews | Church, Richard William; 1815-1890. | 1854 | English | Catholic Church |
| Essays on Religion and Literature | 1865 | English | Academia of the Catholic Religion | |
| Essays on the Primitive Church Offices | Alexander, Joseph A. (Joseph Addison); 1809-1860. | 1851 | English | Church polity |
| Essays on Various Subjects | Wiseman, Nicholas Patrick; 1802-1865. | 1853 | English | Anglican Communion |
| Establishment of Christianity and the Proscription of Paganism, The | Huttmann, Maude Aline; b. 1872. | 1914 | English | Paganism |
| Eternal Priesthood, The | Manning, Henry Edward; 1808-1892. | 1875 | English | Priests |
| Etude Sur L'immaculèe Conception | Perreyve, Henri. | 1881 | French | Immaculate Conception |
| Etudes Sur L'administration de Rome Au Moyen Age (751-1252) | Halphen, Louis; 1880-1950. | 1907 | French | Popes |
| Eucharist and Penance in the First Six Centuries of the Church | Rauschen, Gerhard; 1854-1917. | 1913 | English | Lord's Supper |
| Eutropia, or, How to Find a Way Out of Darkness and Doubt Into Light and Certainty | Devine, Pius. | 1880 | English | Faith |
| Evangelische Polemik Gegen Die Römische Kirche | Tschackert, Paul. | 1888 | German | Catholic Church |
| Eve of Catholic Emancipation: Being the History of the English Catholics During the First Thirty Years of theNineteenth Century, The | Ward, Bernard; 1857-1920. | 1911 | English | Catholic emancipation |
| Evenings With the Romanists: With an Introductory Chapter on the Moral Results of the Romish System | Seymour, M. Hobart; (Michael Hobart); 1800-1874. | 1856 | English | Catholic Church |
| Evidences and Doctrines of the Catholic Church: Showing That the Former Are No Less Convincing Than the LatterAre Propitious to the Happiness of Society, The | MacHale, John; 1791-1881. | 1885 | English | Catholic Church |
| Evidences of Catholicity: A Series of Lectures, The | Spalding, M. J. (Martin John); 1810-1872. | 1875 | English | Catholic Church |
| Evil of Consenting to Popery: A Sermon, The | Jones, Hugh. | 1849 | English | Catholic Church |
| Evsebiana: Essays on the Ecclesiastical History of Eusebius, Bishop of Caesarea | Lawlor, Hugh Jackson; 1860-1938. | 1912 | English | Eusebius |
| Examen ConcilII Tridentini, Das Ist, Beleuchtung Und Widerlegung Der Beschlüsse Des Tridentinischen Konzils | Chemnitz, Martin; 1522-1586. | 1884 | German | Catholic Church |
| Examen Critico-Apologeticum Super Constitutionem Dogmaticam de Fide Catholica Editam in Sessione Tertia SS. Oecumenici ConcilII Vaticani | Ciasca, Augustino; 1834-1902. | 1872 | Latin | Vatican Council |
| Exercices Spirituels D'après Saint Ignace | Ignatius; of Loyola, Saint; 1491-1556. | 1890 | French | Ignatius |
| Explanation of the Holy Sacraments: A Complete Exposition of the Sacraments and the Sacramentals of the Church | Rolfus, Hermann; 1821-1896. | 1898 | English | Sacraments |
| Explanation of the Rule of St. Augustine | Hugh; of Saint-Victor; 1096?-1141. | 1911 | English | Augustine |
| Exposè de La Doctrine Catholique | Girodon, P. | 1898 | French | Catholic Church |
| Exposition de La Doctrine de L'eglise Catholique Orthodoxe: Accompagnèe Des Diffèrences Qui Se Rencontrent Dans Les Autres Eglises Chrètiennes | Guettèe; abbè; (Wladimir); 1816-1892. | 1884 | French | Catholic Church |
| Exposure of Popery | Ullmann, J. F. (Julius Frederick) | 1892 | English | Catholic Church |
| External Religion: Its Use and Abuse | Tyrrell, George; 1861-1909. | 1900 | English | Faith |
| Faith of Catholics: Confirmed by Scripture and Attested by the Fathers of the First Five Centuries of the Church, The | 1885 | English | Catholic Church | |
| Faith of Our Fathers: Being an Exposition and Vindication of the Church Founded by Our Lord Jesus Christ, The | Gibbons, James; 1834-1921. | 1904 | English | Catholic Church |
| Faith of Our Forefathers: An Examination of Archbishop Gibbons's Faith of Our Fathers, The | Stearns, Edward Josiah; 1810-1890. | 1879 | English | Gibbons, James |
| False Decretals, The | Davenport, E. H. (Ernest Harold); b. 1893. | 1916 | English | Pseudo-Isidorian decretals |
| Father Hecker | Sedgwick, Henry Dwight; 1861-1957. | 1906 | English | Catholics |
| Fènelon, Archbishop of Cambrai: A Biographical Sketch | Lear, H. L. Sidney. | 1877 | English | Fénelon, François de Salignac de la Mothe- |
| First American Catholic Missionary Congress: Held Under the Auspices of the Catholic Church Extension Societyof the United States of America: Containing Official Proceedings, The | 1909 | English | Catholic Church | |
| First American Edition of the Works of the Rev. D. W. Cahill, D.D: The Highly Distinguished Irish Priest, Patriot and Scholar: Containing a Brief Sketch of His Life, the Most Important Addresses, Speeches, Controversial Sermons &c. Delivere | Cahill, D. W. (Daniel William); 1796-1864. | 1854 | English | Catholic Church |
| First Christians, or, Christian Life in New Testament Times, The | Veitch, Robert. | 1906 | English | Christian life |
| First Ecumenical Council: That Is, the First Council of the Whole Christian World, Which Was Held A.D. 325 atNicaea in Bithynia, The | 1891 | English | Councils and synods, Ecumenical | |
| First Letter to the Rev. Father Gratry: Priest of the Oratoire, Member of the Academy | Dechamps, Victor Auguste; 1810-1883. | 1870 | English | Popes |
| First Letter to the Very Rev. J. H. Newman, D.D: In Explanation, Chiefly in Regard to the Reverential Love Due to the Ever-Blessed Theotokos, and the Doctrine of Her Immaculate Conception: With an Analysis of Cardinal de Turrecremata's Work | Pusey, E. B. (Edward Bouverie); 1800-1882. | 1869 | English | Immaculate Conception |
| Flowers of a Mystic Garden | Ruusbroec, Jan van; 1293-1381. | 1912 | English | Spiritual life |
| Forschungen Und Quellen Zur Geschichte Des Konstanzer Konzils | Finke, Heinrich; 1855-1938. | 1889 | German | Council of Constance |
| Fradryssa: The Ex-Monk and Imposter: A True Pen-Picture of the Ex-Priest and His Many Aliases. | Blenk, James H. | 1910 | English | Fradryssa, G. V |
| Frederic Ozanam, Professor at the Sorbonne: His Life and Works | O'Meara, Kathleen; 1839-1888. | 1878 | English | Catholics |
| Freiheit, Autorität Und Kirche: Erörterungen Über Die Grossen Probleme Der Gegenwart | Ketteler, Wilhelm Emmanuel; Freiherr von; 1811-1877. | 1862 | German | Liberty |
| From St. Francis to Dante: Translations From the Chronicle of the Franciscan Salimbene, 1221-1288: With Notes and Illustrations From Other Medieval Sources | Coulton, G. G. (George Gordon); 1858-1947. | 1907 | English | Salimbene |
| Fundamental Fallacy of Socialism: An Exposition of the Question of Landownership: Comprising an Authentic Account of the Famous Mcglynn Case, The | 1908 | English | Property and socialism | |
| Fundamental Ideas of the Roman Catholic Church: Explained and Discussed for Protestants and Catholics, The | Foster, Frank Hugh; 1851-1935. | 1899 | English | Catholic Church |
| Future of Catholic Peoples: Protestant and Catholic Civilization Compared: An Essay Contrasting Protestant andCatholic Efforts for Civilization, The | Haulleville, Prosper Charles Alexander; Baron de; 1830-1898. | 1878 | English | Comparative civilization |
| Galileo Galilei and the Roman Curia | Gebler, Karl von. | 1879 | English | Trials (Heresy) |
| Gallican Church and the Revolution: A Sequel to the "History of the Church of France From the Concordat of Bologna to the Revolution", The | Jervis, William Henley; 1813-1883. | 1882 | English | Gallicanism |
| Genius of the Roman Rite: Being a Paper, The | Bishop, Edmund; 1846-1917. | 1902 | English | Catholic Church |
| George Calvert and Cecilius Calvert, Barons Baltimore of Baltimore | Browne, William Hand; 1828-1912. | 1890 | English | Catholics |
| Gerbert, Une Pape Philosophe: D'après L'histoire Et D'après La Lègende | Picavet, F. (Francìois); 1851-1921. | 1897 | French | Popes |
| Geschichte Der Entstehung Und Ausbildung Des Kirchenstaates | Sugenheim, Samuel; 1811-1877. | 1854 | German | Papal States |
| Geschichte Der Jesuiten in Den Ländern Deutscher Zunge Im XVI. Jahrhundert | Duhr, Bernhard. | 1907 | German | Jesuits |
| Geschichte Der Jesuiten in Den Ländern Deutscher Zunge in Der Ersten Hälfte Des XVII. Jahrhunderts | Duhr, Bernhard. | 1913 | German | Jesuits |
| Geschichte Der Katholischen Katachese | Probst, Ferdinand; 1816-1899. | 1886 | German | Catechetics |
| Geschichte Der Katholischen Kirche in Irland Von Der Einführung Des Christenthums Bis Auf Die Gegenwart | Bellesheim, Alphons; 1839-1912. | 1890 | German | Catholic Church |
| Geschichte Der Katholischen Kirche in Schottland: Von Der Einführung Des Christenthums Bis Auf Die Gegenwart | Bellesheim, Alphons; 1839-1912. | 1883 | German | Catholic Church |
| Geschichte Der Katholischen Kirche: Von Der Mitte Des 18. Jahrhunderts Bis Zum Vatikanischen Konzil | Mirbt, Carl. | 1913 | German | Catholic Church |
| Geschichte Der Kirchlichen Trennung Zwischen Dem Orient Und Occident: Von Den Ersten Anfängen Bis Zur Jüngsten Gegenwart | Pichler, A. (Aloys); 1833-1874. | 1864 | German | Schism |
| Geschichte Der Quietistischen Mystik in Der Katholischen Kirche | Heppe, H. (Heinrich); 1820-1879. | 1875 | German | Quietism |
| Geschichte Der Reaction Kaiser Julians Gegen Die Christliche Kirche | Rode, Friedrich. | 1877 | German | Persecution |
| Geschichte Der Union Der Ruthenischen Kirche Mit Rom: Von Den Ältesten Zeiten Bis Auf Die Gegenwart | Pelesh, IÍ¡UliÍ¡an; 1843-1896. | 1878 | German | Catholic Church |
| Geschichte Des Allmaeligen Verfalls Der Unirten Ruthenischen Kirche Im XVIII Und XIX Jahrhundert Unter Polnischem Und Russischem Scepter | Likowski, Eduard. | 1885 | German | Catholic Church |
| Geschichte Des Canonischen Eherechts: Bis Zum Verfall Der Glossenlitteratur | Freisen, Joseph; 1853-1932. | 1893 | German | Marriage (Canon law) |
| Geschichte Des Katholischen Modernismus | Kübel, Johannes; b. 1873. | 1909 | German | Modernism |
| Geschichte Des Kulturkampfes Im Deutschen Reiche: Im Auftrage Des Zentralkomitees Für Die Generalversammlungen Der Katholiken Deutschlands | Kissling, Johannes B. (Johannes Baptist); b. 1876. | 1911 | German | Kulturkampf |
| Geschichte Des Römischen Katechismus | Corvin von Skibniewski, Stephan Leo; Ritter. | 1903 | German | Catholic Church |
| Geschichte Des Vatikanischen Konzils | Friedrich, J. (Johann); 1836-1917. | 1877 | German | Popes |
| Geschichte Des Vatikanischen Konzils: Von Seiner Ersten Ankündigung Bis Zu Seiner Vertagung: Nach Den Authentischen Dokumenten | Granderath, Theodor; 1839-1902. | 1903 | German | Popes |
| Geschiedenis En Kritiek Der Hedendaagsche Oud-katholieke Beweging in Duitschland Van Juli 1870 Tot Mei 1877 | Knuttel, Willem Pieter Cornelis; 1854-1921. | 1877 | Dutch | Old Catholic Church |
| Gli Studi Religiosi in Italia | Minocchi, Salvatore; 1869- | 1901 | Italian | Modernism |
| Graces of Interior Prayer; Des Gràces D'oraison: A Treatise on Mystical Theology, The | Poulain, Aug. (Augustin); 1836-1919. | 1912 | English | Mysticism |
| Great Encyclical Letters of Pope Leo XIII: Translations From Approved Sources, The | 1903 | English | Encyclicals, Papal | |
| Great Red Dragon, or, The Master Key to Popery, The | Gavin, Antonio; fl. 1726. | 1854 | English | Catholic Church |
| Greek Catholic Church: Paper Read Before the Exeter College Church Society on May 25th, 1901, The | Sheridan, Richard Brinsley; 1751-1816. | 1901 | English | Catholic Church |
| Grègoire, the Priest and the Revolutionist | Gregory, Caspar Renè; 1846-1917. | 1876 | English | Grégoire, Henri |
| Gregor Der Grosse Und Seine Zeit. Erster Band | Pfahler, Georg. | 1852 | German | Papacy |
| Gregor Der Grosse: Lebensbild Zur 1300 Jährigen Wiederkehr Seines Todestages | Bilguer; Dr. von. | 1904 | German | Popes |
| Gregor I. Der Grosse: Ein Lebensbild | Bonsmann, Th. | 1890 | German | Popes |
| Gregor VII: Sein Leben Und Wirken | Martens, Wilhelm. | 1894 | German | Popes |
| Gregor VIII. 57 Tägiges Pontifikat | Nadig, Paul. | 1890 | German | Papacy |
| Gregory the Great | Barmby, J. (James); 1822-1897. | 1892 | English | Popes |
| Grounds of Faith: Four Lectures, The | Manning, Henry Edward; 1808-1892. | 1852 | English | Faith |
| Growth and Development of the Catholic School System in the United States, The | Burns, J. A. (James Aloysius); 1867-1940. | 1912 | English | Catholic Church |
| Growth of Church Institutions, The | Hatch, Edwin; 1835-1889. | 1887 | English | Church polity |
| Guignol Et La Rèvolution Dans L'èglise Romaine: M. Veuillot Et Son Parti Condamnès Par Les Archeveìques Et Èveìques de Paris, Tours, Viviers, Orlèans, Marseille, Verdun, Chartres, Moulins, Etc. | Michaud, E. (Eugène); 1839-1917. | 1872 | French | Veuillot, Louis |
| Hammersmith Protestant Discussion: Being an Authenticated Report of the Controversial Discussion Between the Rev. John Cumming, D.D. of the Scottish National Church, Crown Court, Covent Garden, and Daniel French, Esq., Barrister-at-Law, O, The | Cumming, John; 1807-1881. | 1852 | English | Protestantism |
| Handbuch Der Christ-Katholischen Religion: Zum Selbstunterricht | Weninger, F. X. (Francis Xavier); 1805-1888. | 1858 | German | Catholic Church |
| Handbuch Der Protestantischen Polemik Gegen Die Römisch-Katholische Kirche | Hase, Karl von; 1800-1890. | 1894 | German | Catholic Church |
| Hard Sayings: A Selection of Meditations and Studies | Tyrrell, George; 1861-1909. | 1910 | English | Meditations |
| Hat Jesus Das Papsttum Gestiftet?: Eine Dogmengeschichtliche Untersuchung | Schnitzer, Joseph; 1859-1939. | 1910 | German | Papacy |
| Haydock Papers: A Glimpse Into English Catholic Life Under the Shade of Persecution and in the Dawn of Freedom, The | Gillow, Joseph; 1850-1921. | 1888 | English | Catholics |
| Heavenly Home, or, The Employments and Enjoyments of the Saints in Heaven, The | Harbaugh, H. (Henry); 1817-1867. | 1853 | English | Heaven |
| Heìrmà Nabì: The Ethiopic Version of Pastor Hermae | Schodde, George Henry; 1854-1917. | 1876 | English | Hermas |
| Henri Perreyve | Gratry, A. (Auguste); 1805-1872. | 1880 | English | Catholics |
| Henry and Antonio, or the Proselytes of the Romish and Evangelical Churches | Bretschneider, Karl Gottlieb; 1776-1848. | 1834 | English | Catholic Church |
| Henry the Third and the Church: A Study of His Ecclesiastical Policy and of the Relations Between England and Rome | Gasquet, Francis Aidan; Cardinal; 1846-1929. | 1905 | English | Henry |
| Herdabref Till Pràsterskapet Och Fòrsamlingarna I Uppsala Àrkestift | Sòderblom, Nathan; 1866-1931. | 1914 | Swedish | Clergy |
| Hermae Pastor Graece: Addita Versione Latina Recentiore E Codice Palatino | Gebhardt, Oscar von; 1844-1906. | 1877 | Latin | Hermas |
| Hermits and Anchorites of England, The | Clay, Rotha Mary. | 1914 | English | Hermits |
| Hermits, The | Kingsley, Charles; 1819-1875. | 1868 | English | Hermits |
| Herzogs Albrecht Von Preussen, Gewesenen Hochmeisters Des Deutschen Ordens Erfolgte, Und Friedrich I., Königs Von Preussen, Versuchte Rückkehr Zur Katholischen Kirche: Nebst Einem Geschichtlichen Anhange Über Die Wiedervereinigung Mehre | Theiner, Augustin; 1804-1874. | 1846 | German | Catholic converts |
| Het Roomsche Gevaar | Eerdmans, B. D. (Bernardus Dirk); 1868-1948. | 1913 | Dutch | Catholic Church |
| Hierarchia Catholica MedII Aevi, Sive, Summorum Pontificum, S.R.E. Cardinalium, Ecclesiarum Antistitum Series | 1898 | Latin | Popes | |
| Hierarchy of the Catholic Church in the United States: Embracing Sketches of All the Archbishops and Bishops From the Establishment of the See of Baltimore to the Present Time: Also, an Account of the Plenary Councils of Baltimore, and a Brief History, Th | Shea, John Dawson Gilmary; 1824-1892. | 1886 | English | Bishops |
| Hildebrand, the Builder | Smith, Ernest Ashton. | 1908 | English | Popes |
| Hinkmar: Erzbischof Von Reims: Sein Leben Und Seine Schriften | Schrörs, Heinrich. | 1884 | German | Hincmar |
| Hippolytus Von Rom in Seiner Stellung Zu Staat Und Welt: Neue Funde Und Forschungen Zur Geschichte Von Staat Und Kirche in Der Römischen Kaiserzeit | Neumann, Karl Johannes; 1857-1917. | 1902 | German | Antichrist |
| Histoire Critique Du Catholicisme Libèral En France: Jusqu'au Pontificat de Lèon XIII: Complèment de Toutes Les Histoires de L'eglise | Fèvre; Monseigneur; (Justin Louis Pierre); 1825-1907. | 1897 | French | Liberalism (Religion) |
| Histoire de Grègoire VII: Precèdèe D'un Discours Sur L'histoire de La Papautè Jusqu'au Xie Siècle | Villemain; M. (Abel-Francìois); 1790-1870. | 1874 | French | Popes |
| Histoire de La Papautè Pendant Le xive Siècle: Avec Des Notes Et Des Pièces Justificatives | Christophe, J.-B. | 1853 | French | Papacy |
| Histoire de La Thèologie Positive | Turmel, Joseph; 1859-1943. | 1904 | French | Theology, Doctrinal |
| Histoire de L'èdition Bènèdictine de Saint Augustin | Ingold, A. M. P. (Augustin Marie Pierre); 1852-1923. | 1903 | French | Augustine |
| Histoire de L'eglise de Corèe: Prècèdèe D'une Introduction Sur L'histoire, Les Institutions, La Langue, Les Moeurs Et Coutumes Corèennes: Avec Carte Et Planches | Dallet, Charles. | 1874 | French | Catholic Church |
| Histoire de Saint Augustin: Sa Vie, Ses Oeuvres, Son Siècle, Influence de Son Gènie | Poujoulat; M. 1808-1880. | 1852 | French | Augustine |
| Histoire Des Ètablissements Religieux Britanniques Fondès À Douai Avant La Rèvolution Francìaise | Dancoisne, L. (Louis); b. 1827. | 1880 | French | Refugees, Religious |
| Histoire Des Pèlerinages de La Sainte Vierge En France | Leroy, Louis. | 1873 | French | Mary |
| Histoire Des Variations Et Contradictions de L'èglise Romaine | Ponnat; baron de. | 1891 | French | Catholic Church |
| Histoire Du Catholicisme Libèral En France, 1828-1908 | Weill, Georges; 1865-1944. | 1909 | French | Liberalism (Religion) |
| Histoire Du Dogme de La Papautè: Des Origines À La Fin Du Quatrième Siècle | Turmel, Joseph; 1859-1943. | 1908 | French | Papacy |
| Histoire Du Modernisme Catholique | Houtin, Albert; 1867-1926. | 1913 | French | Modernism |
| Histoire Du Pape Calixte II | Robert, Ulysse; 1845-1903. | 1891 | French | Popes |
| Histoire Politique Des Papes | Lanfrey, P. | 1873 | French | Papacy |
| Historia Aliquot Martyrum Anglorum Maxime Octodecim Cartusianorum: Sub Rege Henrico Octavo Ob Fidei Confessionem Et Summi Pontificis Jura Vindicanda Interemptorum | Chauncy, Maurice; ca. 1509-1581. | 1888 | Latin | Christian martyrs |
| Historia de La Publicaciòn Monumenta Historica Societatis Jesu | Gòmez Rodeles, Cecilio; 1844-1913. | 1913 | Spanish | Jesuits |
| Historia Tou Schismatos Teìs Latinikeìs Eccleìsias Apo Teìs Orthodoxou Hellenikeìs | DeÌ„meÌ„trakopoulos, Andronikos K. | 1867 | Greek | Schism |
| Historic Martyrs of the Primitive Church, The | Mason, Arthur James; 1851-1928. | 1905 | English | Christian martyrs |
| Historical Lectures to Non-Catholics | O'Connor, Joseph V. | 1898 | English | Catholic Church |
| Historical Notes on the Tractarian Movement, A.D. 1833-1845 | Oakeley, Frederick; 1902-1880. | 1865 | English | Oxford movement |
| Historical Notice of Penal Laws Against Roman Catholics: Their Operation and Relaxation During the Past Century, of Partial Measures of Relief in 1779, 1782, 1793, 1829, and of Penal Laws Which Remain Unrepealed, or Have Been Rendered More... | Madden, Richard Robert; 1798-1886. | 1865 | English | Penal laws (against nonconformists) |
| History of Catholic Emancipation and the Progress of the Catholic Church in the British Isles: (Chiefly in England) From 1771 to 1820, The | Amherst, W. J. (William Joseph); 1820-1904. | 1886 | English | Catholic emancipation |
| History of Latin Christianity: Including That of the Popes to the Pontificate of Nicolas V | Milman, Henry Hart; 1791-1868. | 1883 | English | Papacy |
| History of Rome and the Popes in the Middle Ages | Grisar, Hartmann; 1845-1932. | 1911 | English | Papacy |
| History of St. Dominic: Founder of the Friars Preachers, The | Drane, Augusta Theodosia; 1823-1894. | 1891 | English | Dominic |
| History of the Catholic Church in Scotland: From the Introduction of Christianity to the Present Day | Bellesheim, Alphons; 1839-1912. | 1887 | English | Catholic Church |
| History of the Catholic Church in the Nineteenth Century (1789-1908) | MacCaffrey, James; 1875-1935. | 1910 | English | Church history |
| History of the Catholic Church in the United States | Shea, John Dawson Gilmary; 1824-1892. | 1890 | English | Catholic Church |
| History of the Catholic Church in the United States: From the Earliest Settlement of the Country to the Present Time: With Biographical Sketches, Accounts of Religious Orders, Councils | Courcy, Henri de. | 1879 | English | Catholic Church |
| History of the Catholic Church: For Use in Seminaries and Colleges | Brùck, Heinrich; 1831-1903. | 1885 | English | Church history |
| History of the Condemnation of the Patriarch Nicon: by a Plenary Council of the Orthodox Catholic Eastern Church Held at Moscow A.D. 1666-1667 | Ligaridēs, Paisios; 1609 or 10-1678. | 1873 | English | Nikon |
| History of the Council of Trent | Bungener, Fèlix; 1804-1874. | 1855 | English | Council of Trent |
| History of the Councils of the Church | Hefele, Karl Joseph von; 1809-1893. | 1883 | English | Councils and synods |
| History of the Fall of the Jesuits in the Eighteenth Century | Saint-Priest, Alexis de; comte; 1805-1851. | 1845 | English | Jesuits |
| History of the Holy, Military, Sovereign Order of St. John of Jerusalem: Or Knights Hospitallers, Knights Templars, Knights of Rhodes, Knights of Malta, The | Taaffe, John; 1787-1862. | 1852 | English | Knights of Malta |
| History of the Jesuits in England, 1580-1773, The | Taunton, Ethelred L. (Ethelred Luke); 1857-1907. | 1901 | English | Jesuits |
| History of the Jesuits: Their Origin, Progress, Doctrines, and Designs | Nicolini, G. B. (Giovanni Battista) | 1893 | English | Jesuits |
| History of the Papacy in the XIXth Century, The | Nielsen, Fredrik; 1846-1907. | 1906 | English | Papacy |
| History of the Papacy to the Period of the Reformation, The | Riddle, J. E. (Joseph Esmond); 1804-1859. | 1854 | English | Papacy |
| History of the Penal Laws Enacted Against Roman Catholics: The Operation and Results of That System of Legalized Plunder, Persecution, and Proscription Originating in Rapacity and Fraudulent Designs, Concealed Under False Pretences, Figme, The | Madden, Richard Robert; 1798-1886. | 1847 | English | Penal laws (against nonconformists) |
| History of the Popes During the Last Four Centuries, The | Ranke, Leopold von; 1795-1886. | 1913 | English | Papacy |
| History of the Popes: From the Foundation of the See of Rome to A.D. 1758, The | Bower, Archibald; 1686-1766. | 1844 | English | Papacy |
| History of the Popes: Their Church and State, and Especially of Their Conflicts With Protestantism in the Sixteenth and Seventeenth Centuries | Ranke, Leopold von; 1795-1886. | 1884 | English | Popes |
| History of the Religious House of Pluscardyn: Convent of the Vale of Saint Andrew in Morayshire: With Introduction, Containing the History and a Description of the Present State of the Mother-House of the Order of Vallis Caulium (Val Des Cho... | Macphail, S. R. (Simeon Ross) | 1881 | English | Priories |
| History of the Romeward Movement in the Church of England 1833-1864, The | Walsh, Walter; 1847-1912. | 1900 | English | Oxford movement |
| History of the Society of Jesus in North America: Colonial and Federal | Hughes, Thomas; 1849-1939. | 1907 | English | Jesuits |
| Holy Catholic Church, the Communion of Saints: A Discourse Delivered at Brunswick Chapel, Newcastle, July 29th, 1873, in Connection With the Assembling of the Wesleyan-Methodist Conference: Being the Fourth Lecture on the Foundation of..., The | Gregory, Benjamin; 1820-1900. | 1873 | English | Church |
| Holy Catholic Church: Her Faith, Works, Triumphs, The | Convert. | 1905 | English | Catholic converts |
| Holy Eucharist, The | Hedley, John Cuthbert; 1837-1915. | 1907 | English | Lord's Supper |
| Holy Man of Tours, or, The Life of Lèon Papin-Dupont: Who Died at Tours in the Odor of Sanctity, March 18, 1876, The | Janvier, Pierre Dèsirè; b. 1817. | 1882 | English | Catholics |
| Holy Sacrifice of the Mass | Mùller, Michael; 1825-1899. | 1883 | English | Mass |
| Holy See and the Wandering of the Nations: From St. Leo I. to St. Gregory I., The | Allies, T. W. (Thomas William); 1813-1903. | 1888 | English | Papacy |
| Holy Spirit in the Ancient Church: A Study of Christian Teaching in the Age of the Fathers, The | Swete, Henry Barclay; 1835-1917. | 1912 | English | Holy Spirit |
| Homely Truth for Honest Men: Letters to the Right Reverend John Hughes, Roman Catholic Bishop of New York | Kirwan; 1802-1861. | 1850 | English | Catholic Church |
| How Catholics Come to Be Misunderstood: A Lecture | O'Gorman, Thomas. | 1890 | English | Anti-Catholicism |
| Idea of a University: Defined and Illustrated: I. in Nine Discourses Addressed to the Catholics of Dublin; II.in Occasional Lectures and Essays Addressed to the Members of the Catholic University, The | Newman, John Henry; 1801-1890. | 1873 | English | Universities and colleges |
| Idea of the Resurrection in the Ante-Nicene Period, The | Staudt, Calvin Klopp. | 1909 | English | Resurrection |
| Ignace D'antioche, Ses Èpitres, Sa Vie, Sa Thèologie: Ètude Critique Suivie D'une Traduction Annotèe | Bruston, Edouard. | 1897 | French | Ignatius |
| Ignatian Epistles Entirely Spurious: A Reply to the Right Rev. Dr. Lightfoot, Bishop of Durham, The | Killen, W. D. (William Dool); 1806-1902. | 1886 | English | Ignatius |
| Ignatius Von Loyola | Gothein, Eberhard; 1853-1923. | 1885 | German | Ignatius |
| Ignatius Von Loyola Und Die Gegenreformation | Gothein, Eberhard; 1853-1923. | 1895 | German | Counter-Reformation |
| Il Cattolico Premunito Contro Gli Attacchi Dei Protestanti | De Mandato, Pio; 1850-1914. | 1904 | Italian | Protestantism |
| Il Dogma Dell' Immacolata: Ragionamenti | Alimonda; cardinale. | 1880 | Italian | Immaculate Conception |
| Il Papa, L'italia E La Guerra | Quadrotta, Guglielmo; b. 1888. | 1915 | Italian | World War, 1914-1918 |
| Il Progresso Dommatico Nel Concetto Cattolico | Palmieri, Aurelio; 1870-1920. | 1910 | Italian | Catholic Church |
| Il Purgatorio Dei Reprobi | Spada, Mariano; 1796-1872. | 1864 | Italian | Purgatory |
| Il S. Officio E La Riforma Religiosa in Friuli: Appunti Storici Documentati | Battistella, Antonio; 1852-1936. | 1895 | Italian | Inquisition |
| Il Santo Officio Della Inquisizione in Napoli: Narrazione Con Molti Documenti Inediti | Amabile, Luigi; 1828-1892. | 1892 | Italian | Inquisition |
| Il Vaticano Regio: Tarlo Superstite Della Chiesa Cattolica: StudII Dedicati Al Giovane Clero Ed Al Laicato Credente Uscente Il 1883 | Curci, C. M. (Carlo Maria) | 1883 | Italian | Catholic Church |
| Illustrated Explanation of the Prayers and Ceremonies of the Mass | Lanslots, Ildephonse; b. 1859. | 1897 | English | Mass |
| Imitation of Christ: New Revised Translation, The | 1905 | English | Spiritual life | |
| Immaculate Conception of the Mother of God: An Exposition, The | Ullathorne, William Bernard; 1806-1889. | 1855 | English | Immaculate Conception |
| Immaculate Conception: Its Antecedents and Consequences, The | Cumming, John; 1807-1881. | 1861 | English | Immaculate Conception |
| Immaculate Conception: Summary of Conferences, The | Vercruysse, Bruno; 1797-1880. | 1874 | English | Catholic Church |
| Impossibility of the Immaculate Conception as an Article of Faith: In Reply to Several Works Which Have Appeared on That Subject of Late Years: To Which Is Added the Author's Letter to the Pope, The | Laborde; M. l'abbè; (Jean Joseph); 1804-1855. | 1855 | English | Immaculate Conception |
| In the Banqueting House:a Series of Sacramental Meditations | Pearse, Mark Guy; 1842-1930. | 1902 | English | Lord's Supper |
| Incubi of Rome and Venice, or, The Criminal History of the Popes; and, the Martyrdom of Venice, The | Beggi; Dr. (Francesco Orzzio) | 1864 | English | Papacy |
| Independence of the Holy See, The | Manning, Henry Edward; 1808-1892. | 1877 | English | Popes |
| Index Canonum: The Greek Text, an English Translation and a Complete Digest of the Entire Code of Canon Law of the Undivided Primitive Church: With a Dissertation on the Seventh Canon of Ephesus and the Chalcedonian Decree of Doctrinal Liber | Fulton, John; 1834-1907. | 1892 | English | Canon law |
| Indian Christians of St. Thomas Otherwise Called the Christians of Malabar: A Sketch of Their History, and anAccount of Their Present Condition, as Well as a Discussion of the Legend of St. Thomas, The | Richards, W. J. (William Joseph) | 1908 | English | Saint Thomas Christians |
| Indifferentism, or, Is One Religion as Good as Another? | MacLaughlin, John. | 1894 | English | Indifferentism (Religion) |
| Infallibilismus Und Katholicismus: Sendschreiben an Einen Infallibilistisch Gesinnten Freund. | 1885 | German | Popes | |
| Infallibility of the Church: A Course of Lectures, The | Salmon, George; 1819-1904. | 1899 | English | Popes |
| Infallibility: A Paper | McNabb, Vincent; 1868-1943. | 1905 | English | Popes |
| Influence of Catholicism on the Sciences and on the Arts, The | Salas y Gilavert, Andrès de. | 1900 | English | Religion and science |
| Inner Rome: Political, Religious, and Social | Butler, C. M. (Clement Moore); 1810-1890. | 1866 | English | Papal States |
| Innocent III. La Croisade Des Albigeois | Luchaire, Achille; 1846-1908. | 1905 | French | Albigenses |
| Innocent III. La Papautè Et L'empire | Luchaire, Achille; 1846-1908. | 1906 | French | Innocent |
| Innocent III. La Question D'orient | Luchaire, Achille; 1846-1908. | 1907 | French | Crusades |
| Innocent III. Les Royautès Vassales Du Saint-Siège | Luchaire, Achille; 1846-1908. | 1908 | French | Popes |
| Innocent III. Rome Et L'italie | Luchaire, Achille; 1846-1908. | 1905 | French | Popes |
| Innocent the Great: An Essay on His Life and Times | Pirie-Gordon, Charles Harry Clinton; b. 1883. | 1907 | English | Innocent |
| Innocenzo X Pamfili E La Sua Corte: Storia Di Roma Dal 1644 Al 1655: Da Nuovi Documenti | Ciampi, Ignazio; 1824-1880. | 1878 | Italian | Innocent |
| Inquisition in the Spanish Dependencies: Sicily, Naples, Sardinia, Milan, the Canaries, Mexico, Peru, New Granada, The | Lea, Henry Charles; 1825-1909. | 1908 | English | Inquisition |
| Inquisition: A Critical and Historical Study of the Coercive Power of the Church, The | Vacandard, E. (Elphège); 1849-1927. | 1907 | English | Inquisition |
| Institutiones Theologiae Dogmaticae Generalis Seu Fundamentalis | Knoll, Albert; 1796-1863. | 1880 | Latin | Theology, Doctrinal |
| Instruction Pastorale de Monseigneur L'èvèque D'orlèans Sur L'immaculèe Conception de La Très-Sainte Vierge | Dupanloup, Fèlix; 1802-1878. | 1855 | French | Immaculate Conception |
| Instructions Populaires Sur Les Sacrements | Lobry, J.-B. | 1883 | French | Sacraments |
| Interdict: Its History and Its Operation: With Special Attention to the Time of Pope Innocent III, 1198-1216, The | Krehbiel, Edward B. (Edward Benjamin); b. 1878. | 1909 | English | Interdict (Canon law) |
| Internal Evidence of the Letter "Apostolicae Curae" as to Its Own Origin and Value, The | Collins, William Edward; 1867-1911. | 1897 | English | Anglican orders |
| Introduction to the Sacred Scriptures: In Two Parts | MacDevitt, J. (John) | 1895 | English | Catholic Church |
| Invitation Answered: A Reply to Dr. J. Kent Stone's "Invitation Heeded": And to His Holiness, Pope Pius the Ninth's Invitation to the Vatican Council, The | Smythe, W. Herbert. | 1871 | English | Stone, James Kent |
| Inward Gospel: Some Familiar Discourses Addressed to Religious Who Follow the Rules of St. Ignatius, The | Strappini, W. D. (Walter Diver) | 1909 | English | Meditations |
| Ipse, Ipsa - Ipse, Ipsa, Ipsum, Which?: The Latin Various Readings, Genesis III. 15 | Quigley, Richard F. | 1890 | English | Immaculate Conception |
| Ireland's Case Stated in Reply to Mr. Froude | Burke, Thomas N. (Thomas Nicholas); 1830-1882. | 1873 | English | British |
| Is Healthful Reunion Impossible?: A Second Letter to the Very Rev. J. H. Newman, D.D. | Pusey, E. B. (Edward Bouverie); 1800-1882. | 1870 | English | Newman, John Henry |
| Is Romanism Real Christianity? | Newman, Francis William; 1805-1897. | 1872 | English | Abbot, Francis Ellingwood |
| Is the Pope Independent?, or, Outlines of the Roman Question | Prior, John. | 1900 | English | Roman question |
| Istruzioni Morali Sopra La Dottrina Cristiana | Vicentini, Francesco. | 1842 | Italian | Catechetics |
| Italia Pontificia, Sive, Repertorium Privilegiorum Et Litterarum A Romanis Pontificibus Ante Annum MCLXXXXVIII. Vol. 1; Roma: Italiae EcclesIIs, MonasterIIs, Civitatibus Singulisque Personis Concessorum | Kehr, Paul Fridolin; 1860-1944. | 1906 | Latin | Catholic Church |
| Italia Pontificia, Sive, Repertorium Privilegiorum Et Litterarum A Romanis Pontificibus Ante Annum MCLXXXXVIII. Vol. 2; Latium: Italiae EcclesIIs, MonasterIIs, Civitatibus Singulisque Personis Concessorum | Kehr, Paul Fridolin; 1860-1944. | 1907 | Latin | Catholic Church |
| Italia Pontificia, Sive, Repertorium Privilegiorum Et Litterarum a Romanis Pontificibus Ante Annum MCLXXXXVIIi. Vol. 3; Etruria: Italiae EcclesIIs, MonasterIIs, Civitatibus Singulisque Personis Concessorum | Kehr, Paul Fridolin; 1860-1944. | 1908 | Latin | Catholic Church |
| Italia Pontificia, Sive, Repertorium Privilegiorum Et Litterarum a Romanis Pontificibus Ante Annum MCLXXXXVIII. Vol. 4; Umbria Picenum Marcia: Italiae EcclesIIs, MonasterIIs, Civitatibus Singulisque Personis Concessorum | Kehr, Paul Fridolin; 1860-1944. | 1909 | Latin | Catholic Church |
| Italia Pontificia, Sive, Repertorium Privilegiorum Et Litterarum a Romanis Pontificibus Ante Annum MCLXXXXVIII. Vol. 5; Aemilia, Sive, Provincia Ravennas: Italiae EcclesIIs, MonasterIIs, Civitatibus Singulisque Personis Concessorum | Kehr, Paul Fridolin; 1860-1944. | 1911 | Latin | Catholic Church |
| Italia Pontificia, Sive, Repertorium Privilegiorum Et Litterarum a Romanis Pontificibus Ante Annum MCLXXXXVIII. Vol. 6; Liguria, Sive, Provincia Mediolanensis: Italiae EcclesIIs, MonasterIIs, Civitatibus Singulisque Personis Concessorum | Kehr, Paul Fridolin; 1860-1944. | 1913 | Latin | Catholic Church |
| Italy in the Thirteenth Century | Sedgwick, Henry Dwight; 1861-1957. | 1912 | English | Civilization, Medieval |
| Iter Italicum | Pflugk-Harttung, Julius von; 1848-1919. | 1883 | Latin | Papacy |
| Iuris Ecclesiastici Graecorum Historia Et Monumenta Iussu PII IX. Pont. Max. | 1864 | Latin | Canon law | |
| Jansenists: Their Rise, Persecutions by the Jesuits, and Existing Remnant: A Chapter in Church History, The | Tregelles, Samuel Prideaux; 1813-1875. | 1851 | English | Jansenists |
| Jean de Lasco: Baron de Pologne, Èveìque Catholique, Rèformateur Protestant, 1499-1560: Son Temps, Sa Vie, Ses Oeuvres | Pascal, George; b. 1865. | 1894 | French | Laski, Jan |
| Jean-Adam Mòhler Et L'ècole Catholique de Tubingue, 1815-1840: Ètude Sur La Thèologie Romantique En Wurtemberg Et Les Origines Germaniques Du Modernisme | Vermeil, Edmond; b. 1878. | 1913 | French | Tübingen School (Catholic theology) |
| Jean-Dominique Mansi Et Les Grandes Collections Conciliaires: Ètude D'histoire Littèraire: Suivie D'une Correspondance Inèdite de Baluze Avec Le Cardinal Casanate, Et de Lettres de Pierre Morin, Hardouin, Lupus, Mabillon Et Montfaucon | Quentin, Henri; 1872-1935. | 1900 | French | Councils and synods |
| Jeremiah: Priest and Prophet | Meyer, F. B. (Frederick Brotherton); 1847-1929. | 1894 | English | Jeremiah |
| Jèrusalem Nouvelle. Fascicule 1 Et 2; Aelia Capitolina, Le Saint-Sepulcre Et Le Mont Des Oliviers | Vincent, Hugues; b. 1872. | 1914 | French | Mount of Olives (Jerusalem) |
| Jerusalem, Ancient and Modern: Outlines of Its History and Antiquities: With Descriptions of Its Topography, and the Principal Points of Interest in Both the Ancient and Modern City, Including the Temple as It Was in the Time of Christ... | Warren, Israel P. (Israel Perkins); 1814-1892. | 1873 | English | Jerusalem |
| Jesuit Conspiracy: The Secret Plan of the Order, The | Leone; abbè; (Jacopo) | 1848 | English | Jesuits |
| Jesuit Education: Its History and Principles Viewed in the Light of Modern Educational Problems | Schwickerath, Robert. | 1903 | English | Jesuits |
| Jesuiten-Fabeln: Ein Beitrag Zur Culturgeschichte | Duhr, Bernhard. | 1892 | German | Jesuits |
| Jèsuites Hors La Loi | Cayla, J.-M. (Jean-Mamert); 1812-1877. | 1869 | French | Jesuits |
| Jesuits in Great Britain: An Historical Inquiry Into Their Political Influence, The | Walsh, Walter; 1847-1912. | 1903 | English | Jesuits |
| Jesuits! | Fèval, Paul; 1817-1887. | 1879 | English | Jesuits |
| Jesuits, The | Michelet, Jules; 1798-1874. | 1845 | English | Jesuits |
| Jesuits: Their Foundation and History, The | B. N. (Benjamin Neave) | 1879 | English | Jesuits |
| Johann Eck Als Junger Gelehrter: Eine Literar-Und Dogmengeschichtliche Untersuchung Über Seinen Chrysopassus Praedestinationis Aus Dem Jahre 1514 | Greving, Joseph; 1868-1919. | 1906 | German | Eck, Johann |
| Johannes Blankenfeld: Ein Lebensbild Aus Dem Anfängen Der Reformation | Schnöring, Wilhelm; b. 1882. | 1905 | German | Blankenfeld, Johannes |
| Johannis Burchardi, Argentinensis, Capelle Pontificie Sacrorum Rituum Magistri Diarium, Sive, Rerum Urbanarum CommentarII (1483-1506): Texte Latin Publiè Intègralement Pour La Première Fois: D'après Les Manuscrits de Paris, de Rome… | Burchardus, Johannes; 1450-1506. | 1883 | Latin | Papacy |
| John Machale, Archbishop of Tuam: His Life, Times and Correspondence | O'Reilly, Bernard; 1823-1907. | 1890 | English | MacHale, John |
| John Wiclif's Polemical Works in Latin | Wycliffe, John; d. 1384. | 1883 | Latin | Papacy |
| Journal of a Tour in Italy: With Reflections on the Present Condition and Prospects of Religion in That Country | Wordsworth, Christopher; 1807-1885. | 1863 | English | Catholic Church |
| Judgments of God Upon the Nations: Pius Ninth the Last of the Popes., The | 1855 | English | Antichrist | |
| Kaiser Karl V. Und Die Römische Curie, 1544-1546 | Druffel, August von; 1841-1891. | 1877 | German | Church and state |
| Kardinal Simon de Brion (Papst Martin IV.): Einleitung Und Abschnitt I Und II (Teil 1, 2, 3) | Backes, Nikolaus. | 1910 | German | Popes |
| Karoli Passaglia Sod. E.S.J. Commentariorum Theologicorum | Passaglia, Carlo; 1812-1887. | 1850 | Latin | Trinity |
| Katechese Und Predigt: Vom Anfang Des Vierten Bis Zum Ende Des Sechsten Jahrhunderts | Probst, Ferdinand; 1816-1899. | 1884 | German | Catechumens |
| Katechismus Für Die Katholischen Pfarrschulen Der Vereinigten Staaten | Färber, W. (Wilhelm); 1841-1905. | 1895 | German | Catholic Church |
| Katholisch Oder Jesuitisch?: Drei Zeitgeschichtliche Untersuchungen | Nippold, Friedrich. | 1888 | German | Catholic Church |
| Katholische Dogmatik | Klee, Heinrich; 1800-1840. | 1844 | German | Catholic Church |
| Katholische Dogmatik. | Kuhn, Johannes von. | 1846 | German | |
| Katholische Weltanschauung Und Freie Wissenschaft: Ein Populärwissenschaftlicher Vortrag Unter Berücksichtigung Des Syllabus Pius X Und Der Enzyklika "Pascendi Dominici Gregis" | Wahrmund, Ludwig; 1860-1932. | 1908 | German | Modernism |
| Katholisches Eherecht: Mit Berücksichtigung Der Im Deutschen Reich, in Oesterreich, Der Schweiz Und Im Gebiete Des Code Civil Geltenden Staatlichen Bestimmungen | Schnitzer, Joseph; 1859-1939. | 1898 | German | Marriage (Canon law) |
| Keys of St. Peter, or, A Liberal Protestant View of the Claims of the Papacy, The | Wendte, Charles William; 1844-1931. | 1871 | English | Papacy |
| Kingdom of God on Earth, The | Belaney, R. (Robert) | 1896 | English | Catholic Church |
| Kirchliche Disciplin: In Den Drei Ersten Christlichen Jahrhunderten | Probst, Ferdinand; 1816-1899. | 1873 | German | Church polity |
| Kirchliche Reformentwürfe Beginnend Mit Der Revision Des Bibelkanons: Ehrerbietige Vorlage an Das Vatikanische Concil | Sepp; Prof. Dr. | 1870 | German | Catholic Church |
| Kirwan Unmasked: A Review of Kirwan, in Six Letters Addressed to the Rev. Nicholas Murray | Hughes, John; 1797-1864. | 1851 | English | Kirwan |
| Kleiner Katechismus Der Christlichen Lehre: Zum Gebrauch Für Katholische Schulen | Weninger, F. X. (Francis Xavier); 1805-1888. | 1866 | German | Catholic Church |
| Kleinster Katechismus Zum Nothwendigsten Unterricht Für Die Erste Kommunion | Weninger, F. X. (Francis Xavier); 1805-1888. | 1866 | German | First communion |
| Kniefall Und Fall Des Bischofs Wilh. Em. Freiherrn Von Ketteler | Reinkens, Joseph Hubert; 1821-1896. | 1877 | German | Popes |
| Knowledge of Mary, The | De Concilio, J. (Januarius) | 1878 | English | Mary |
| Konfessionelle Brunnenvergiftung | Keiter, Heinrich; 1853-1898. | 1908 | German | Catholic Church in literature |
| Konstantins Des Grossen Kreuzerscheinung: Eine Kritische Untersuchung | Schrörs, Heinrich. | 1913 | German | Constantine |
| Konzilienstudien Zur Geschichte Des 13. Jahrhunderts: Ergänzungen Und Berichtigungen Zu Hefele-Knöpfler "Conciliengeschichte" Band V Und VI | Finke, Heinrich; 1855-1938. | 1891 | German | Councils and synods |
| Kritik Der V. Döllinger'schen Erklärung Vom 28. März D. J. | Hergenröther, Joseph; 1824-1890. | 1871 | German | Popes |
| Kritische Bemerkungen Zu Meiner Ausgabe Von Origenes' Exhortatio, Contra Celsum, de Oratione: Entgegnung Auf Die Von Paul Wendland in Den Göttingischen Gelehrten Anzeigen 1899 Nr. 4. Veröffentlichte Kritik | Koetschau, Paul; b. 1857. | 1899 | German | Origen |
| Kritische Darstellung Der Forschungen Über Die Entstehungsgeschichte Des Gebetbuchs Kaisers Maximilian I | Giehlow, Karl; 1863-1913. | 1898 | German | Illustrated books |
| Krumme Wege Zur Unfehlbarkeit | Buchmann, J. (Jacob); b. 1805 or 6. | 1874 | German | Papacy |
| La Cause Catholique | Dechamps, Victor Auguste; 1801-1883. | 1863 | French | Catholic Church |
| La Chaire Francìaise Au XiIe Siècle: D'après Les Manuscrits | Bourgain, Louis; b. 1850. | 1879 | French | Clergy |
| La Cochinchine Religieuse | Louvet, L. E. (Louis Eugène) | 1885 | French | Catholic Church in Cochin China |
| La Condanna Del Modernismo: Appunti Polemici | Dehò, Ettore. | 1908 | Italian | Modernism |
| La Confessione Vocale De'peccati: Praticata Nella Sinagoga Antica E Innalzata a Sacramento Da Gesuì€ Cristo Nella Chiesa Cristiana: Con Appendice Intorno Alla Confessione Degli Antichi Pagani Usata Fra I Loro Riti Religiosi: Trattato Storic | Vincenzi, Luigi. | 1850 | Italian | Confession |
| La Congregazione Dell'indice Ed Il Cardinale Zigliara: StudII Critici | Passaglia, Carlo; 1812-1887. | 1882 | Italian | Zigliara, Thoma Maria |
| La Contre-Rèvolution Religieuse Au XVIE Siecle | Philippson, Martin; 1846-1916. | 1884 | French | Counter-Reformation |
| La Crise Du Clergè | Houtin, Albert; 1867-1926. | 1907 | French | Catholic Church |
| La Croyance Gènèrale Et Constante de L'eglise Touchant L'immaculèe Conception de La Bienheureuse Vierge Marie | Gousset; Cardinal; (Thomas Marie Joseph); 1792-1866. | 1855 | French | Immaculate Conception |
| La Doctrine de La Sainte C`ene:essai Dogmatique | Lobstein, P. (Paul); 1850-1922. | 1889 | French | Lord's Supper |
| La Foi Et La Dèvotion A Marie Toujours Immaculèe: Expliquèe Et Proposèe D'après Les Sentiments Et Les Paroles Des Ss. Pères | Parodi, Louis. | 1858 | French | Mary |
| La France Et Le Grand Schisme D'occident | Valois, Noèl; 1855-1915. | 1896 | French | Schism, The Great Western, 1378-1417 |
| La France Et Rome de 1700 À 1715: Histoire Diplomatique de La Bulle Unigenitus Jusqu'a La Mort de Louis XIV D'après Des Documents Inèdits: Dèpòt Des Affaires Ètrangères, Archives D'amersfoort, Etc. | Le Roy, Albert; 1856-1905. | 1892 | French | Jansenists |
| La Hièrarchie Èpiscopale: Provinces, Mètropolitains, Primats En Gaule Et Germanie Depuis La Rèforme de Saint Boniface Jusquà La Mort D'hincmar, 742-882 | Lesne, Emile; b. 1870. | 1905 | French | Catholic Church |
| La Librairie Des Papes D'avignon: Sa Formation, Sa Composition, Ses Catalogues (1316-1420) D'après Les Registres de Comptes Et D'inventaires Des Archives Vaticanes | Faucon, Maurice; 1858-1907. | 1886 | French | Popes |
| La Montèe Du Calvaire | Perroy, Louis; b. 1858. | 1908 | French | Jesus Christ |
| La Nouvelle Lègislation de L'index: Texte Et Commentaire de La Constitution "Officiorum Ac Munerum" Du 25 Janvier 1897 | 1899 | French | Prohibited books (Canon law) | |
| La Papautè Au Moyen Eì: Nicolas Ier, Grègoire VII, Innocent III, Boniface VIII: Ètudes Sur Le Pouvoir Pontifical | Rocquain, Fèlix; 1833-1925. | 1881 | French | Papacy |
| La Papautè: Charlemagne (De 632 À 877 Ap. J.-C.) | Fontane, Marius. | 1901 | English | Papacy |
| La Pènitence Publique Dans L'èglise Primitive | Vacandard, E. (Elphège); 1849-1927. | 1903 | French | Penance |
| La Philosophie Condamnèe | Halleux, Jean. | 1908 | French | Modernism |
| La Politique de Lèon XIII | Germiny, Charles; comte de. | 1902 | French | Popes |
| La Politique de Pie X (1906-1910): Modernistes, Affaires de France, Catholiques D'allemagne Et D'italie, Rèformes Romaines, La "Correspondance de Rome" Et La France, Etc. | Pernot, Maurice; b. 1875. | 1910 | French | Modernism |
| La Religion Catòlica | Mendive, Josè. | 1887 | Spanish | Rationalism |
| La Roma Dei Papi | Pianciani, Luigi; 1810-1890. | 1892 | Italian | Papacy |
| La Sainte Table, Ou, Le Ive Livre de L'imitation de J.-C. | Herbet; abbè. | 1862 | French | Lord's Supper |
| La Sainte Vierge Dans L'histoire | Turmel, Joseph; 1859-1943. | 1908 | French | Mary |
| La Thèologie Catholique Au XIXE Siècle | Bellamy, J. (Julien); 1857-1903. | 1904 | French | Theology, Doctrinal |
| La Vie Paroissiale En France Au XIIIe Siècle: D'après Les Actes Èpiscopaux | Dobiash-RozhdestvenskaiÍ¡a, O. A. (Olgìa Antonovna); 1874-1939. | 1911 | French | Parishes |
| L'abbè de Broglie: Sa Vie--Ses Oeuvres | Largent, Augustin. | 1900 | French | Catholics |
| Lamennais Intime: D'après Une Correspondance Inèdite | Lamennais, Fèlicitè Robert de; 1782-1854. | 1897 | French | Lamennais, Félicité Robert de |
| L'amèricanisme | Houtin, Albert; 1867-1926. | 1904 | French | Americanism (Catholic controversy) |
| Land of the Forum and the Vatican: Or, Thoughts and Sketches During an Easter Pilgrimage to Rome, The | Hall, Newman; 1816-1902. | 1872 | English | Italy |
| L'antechrist | Renan, Ernest; 1823-1892. | 1873 | French | Antichrist |
| L'assunta Nell'odierna Teologia Cattolica: Studio Pubblicato Sul Periodico La Scuola Cattolica, Organo Della Facoltà Teologica Pontificia Di Milano | Crosta, Clino. | 1903 | Italian | Mary |
| Last Days of Papal Rome, 1850-1870, The | De Cesare, Raffaele. | 1909 | English | Italy |
| Lateinische Christliche Inschriften: Mit Einem Anhang, Jùdischer Inschriften | 1908 | Latin | Inscriptions, Latin | |
| Later Mediaeval Doctrine of the Eucharistic Sacrifice, The | Kidd, B. J. (Beresford James); 1863-1948. | 1898 | English | Lord's Supper |
| L'authenticitè Mosàque Du Pentateuque | Mangenot, E. (Eugène); 1856-1922. | 1907 | French | Catholic Church |
| Law of Christian Marriage According to the Teaching and Discipline of the Catholic Church, The | Devine, Arthur; 1849-1919. | 1908 | English | Marriage (Canon law) |
| Law of the Church: A Cyclopaedia of Canon Law. | Taunton, Ethelred L. (Ethelred Luke); 1857-1907. | 1906 | English | |
| Le Catechisme Romain, Ou, L'enseignement de La Doctrine Chrètienne: Explication Nouvelle | Bareille, Georges. | 1906 | French | Theology, Doctrinal |
| Le Catholicisme Dans Les Temps Modernes | 1904 | French | Catholic Church | |
| Le Catholique D'action | Palau, Gabriel. | 1905 | French | Devotional literature, English |
| Le Christianisme Et L'extreì‚ Me Orient. | Joly, Lèon. | 1907 | French | Catholic Church |
| Le Concile de Turin: Essai Sur L'histoire Des Èglises Provencìales Au Ve Siècle Et Sur Les Origines de La Monarchie Ecclèsiastique Romaine (417-450) | Babut, E. Ch. (Ernest Ch.); 1875-1916. | 1904 | French | Popes |
| Le Culte de La B. Vierge Marie, Mère de Dieu: Nouvelles Confèrences Prèchèes À Paris, À Lyon, En Belgique, Etc... Depuis Le Dècret Dogmatique de L'immaculèe Conception | Combalot; abbè. | 1865 | French | Immaculate Conception |
| Le Culte de La Sainte Vierge En Afrique: D'apres Les Monuments Archèologiques | Delattre, A. J. (Alphonse J.); 1841-1928. | 1907 | French | Mary |
| Le Devoir Politique Des Catholiques | Barbier, Emmanuel; 1851-1925. | 1910 | French | Catholic Church |
| Le Dottrine Moderniste: Lettera Enciclica Della Santità Di Nostro Signore Papa Pio X A Tutti I Vescovi Dell'orbe Cattolico. | 1907 | Italian | Modernism | |
| Le Grand Schisme D'occident: D'après Les Documents Contemporains Dèposès Aux Archives Secrètes Du Vatican | Gayet, Louis; b. 1851. | 1889 | French | Schism, The Great Western, 1378-1417 |
| Le Jansènisme Convulsionnaire Et L'affaire de La Planchette: D'après Les Archives de La Bastille | Gagnol; abbè; b. 1850. | 1911 | French | Convulsionaries |
| Le Liber Diurnus Des Pontifes Romains | Rozière, Eugène de; 1820-1896. | 1869 | French | Formularies (Diplomatics) |
| Le Livre de Tout Le Monde, Ou, Le Catèchisme de Malines | Hemel, J. B. van. | 1859 | French | Catholic Church |
| Le Modernisme Et L'infaillibilitè: Le Vrai Prime Le Pape | Jounet, Albert; b. 1860. | 1908 | French | Modernism |
| Le Modernisme: Sa Position Vis-a-Vis de La Science: Sa Condamnation Par Le Pape Pie X | Mercier, Dèsirè; 1851-1926. | 1908 | French | Modernism |
| Le Mois de Marie de L'immaculèe Conception | Gratry, A. (Auguste); 1805-1872. | 1873 | French | Mary |
| Le Pape Et Les Èveìques: Dèfense Du Livre Sur Le Concile Gènèral Et La Paix Religieuse | Maret, Henri-Louis-Charles; 1805-1884. | 1869 | French | Conciliar theory |
| Le Pape Lèon XIII: Sa Vie, Son Action Religieuse, Politique Et Sociale | T'serclaes; Mgr. de; (Charles); 1854-1930. | 1894 | French | Popes |
| Le Pape Saint Gèlase Ier (492-496): Ètude Sur Sa Vie Et Ses Ècrits | Roux, A. | 1880 | French | Papacy |
| Le Pèril Clèrical Sa Seule Solution: Quelques Mots D'actualitè En Rèponse À M. Brunetière Sur La Science Et La Religion | Long, A. | 1898 | French | Brunetière, Ferdinand |
| Le Prèsent Et L'avenir Du Catholicisme En France | Broglie; M. l'abbè de; (Auguste Thèodore Paul); 1834-1895. | 1906 | French | Catholic Church |
| Le Prime Pagine Del Pontificato Di Papa Pio IX | Ballerini, Raffaele; b. 1830. | 1909 | Italian | Papacy |
| Le Programme Des Modernistes: Rèplique À L'encyclique de Pie X, "Pascendi Domini sic Gregis" | 1908 | French | Modernism | |
| Le Protestantisme Et La Règle de Foi | Perrone, Giovanni; 1794-1876. | 1854 | French | Protestantism |
| Le Rèv. P. Gratry | Gratry, A. (Auguste); 1805-1872. | 1913 | French | Theology, Doctrinal |
| Le Rosaire de Marie | Busschere, C. G. M. de; (C. Gonsalve Marie) | 1901 | French | Confraternity of the Most Holy Rosary |
| Le Schisme Oriental Du Xie Siècle | Brèhier, Louis; 1868-1951. | 1899 | French | Schism |
| Le Socialisme Chrètien | Joly, Henri; 1839-1925. | 1892 | French | Socialism, Christian |
| Le Syllabus: Texte Officiel Et Quelques Notes. | 1873 | French | Modernism | |
| Le Triomphe de Marie Sous Le Pontificat de Pie IX, Ou, L'immaculèe Conception Et La Sainte Montagne de La Salette: Documents Officiel s Et Publications Rècentes Des Èveìques de Birmingham (Angleterre), D'orlèans Et de Grenoble Et Du… | 1863 | French | Immaculate Conception | |
| Leander, or, Secrets of the Priesthood | Truman, Ernest. | 1869 | English | Jesuits |
| Leben Des Heiligen Papstes Leo IX | Guibert; Archdeacon of Toul; fl. 11th cent. | 1902 | German | Popes |
| Leben Und Wirken Des Papstes Pius Des Neunten | Wappmannsperger, Leopold. | 1878 | German | Popes |
| Lectures Complete of Father Gavazzi, The | Gavazzi; Father; (Alessandro); b. 1809. | 1854 | English | Catholic Church |
| Lectures on Colet, Fisher, and More, at St. Paul's Cathedral, 1894 | Mason, Arthur James; 1851-1928. | 1895 | English | Colet, John |
| Lectures on Reason and Revelation | Preston, Thomas S. (Thomas Scott); 1824-1891. | 1869 | English | Protestantism |
| Lectures on Romanism | Berg, Joseph F. (Joseph Frederick); 1812-1871. | 1840 | English | Catholic Church |
| Lectures on Romanism: Being Illustrations and Refutations of the Errors of Romanism and Tractarianism | Cumming, John; 1807-1881. | 1854 | English | Oxford movement |
| Lectures on S. Bernard of Clairvaux: With Appendix on the Doctrine of the Immaculate Conception of the B. V. M. | Sparrow-Simpson, W. J. (William John); 1859-1952. | 1895 | English | Immaculate Conception |
| Lectures on Some of the Prophecies Concerning the Rise and Character of the Power Commonly Called Antichrist: And Their Reference to the Church of Papal Rome | Knight, William; 1789 or 90-1878. | 1855 | English | Catholic Church |
| Lectures on the Council of Trent | Froude, James Anthony; 1818-1894. | 1896 | English | Catholic Church |
| Lectures on the History of the Papal Chancery: Down to the Time of Innocent III | Poole, Reginald Lane; 1857-1939. | 1915 | English | Bulls, Papal |
| Lectures on the Influence of the Institutions, Thought and Culture of Rome, on Christianity and the Development of the Catholic Church Microfiche | Renan, Ernest; 1823-1892. | 1885 | English | Church history |
| Lectures on the Present Position of Catholics in England | Newman, John Henry; 1801-1890. | 1851 | English | Anti-Catholicism |
| Lectures. Third Series | 1897 | English | Catholic Church | |
| L'èdit de Calliste: Ètude Sur Les Origines de La Pènitence Chrètienne | Alès, Adhèmar d'; 1861-1938. | 1914 | French | Penance |
| Legends of the Madonna: As Represented in the Fine Arts: Forming the Third Series of Sacred and Legendary Art | Jameson; Mrs. (Anna); 1794-1860. | 1872 | English | Mary |
| Legends of the Virgin and Christ, With Special Reference to Literature and Art | Guerber, H. A. (Hèlène Adeline); d. 1929. | 1896 | English | Mary |
| L'èglise Catholique Et La Libertè Aux Etats-Unis | Meaux, Marie Camille Alfred; vicomte de; 1830-1907. | 1893 | French | Catholic Church |
| L'èglise Catholique Et Les Protestants | Romain, Georges; b. 1819. | 1900 | French | Protestantism |
| L'eglise de Paris Pendant La Rèvolution Francìaise, 1789-1801 | Delarc, O. (Odon); d. 1898. | 1895 | French | Catholic Church |
| L'eglise Et La Critique | Mignot, Eudoxe Irènèe Edouard; 1842-1918. | 1910 | French | Modernism |
| L'èglise Et La Critique Biblique (Ancien Testament) | Brucker, Joseph. | 1907 | French | Catholic Church |
| L'eglise Et La Sorcellerie: Prècis Historique, Suivi Des Documents Officiels, Des Textes Principaux, Et D'un Procès Inèdit | Francìais, J. | 1910 | French | Occultism |
| L'èglise Latine Et Le Protestantisme Au Point de Vue de L'èglise D'orient: Recueil D'articles Sur Des Questions Religieuses, Ècrits `a Diffèrentes Èpoques Et `a Diverses Occasions | KhomiÍ¡akov, A. S. (Alekseì† Stepanovich); 1804-1860. | 1872 | French | Protestantism |
| L'eglise Romaine Et Les Origines de La Renaissance | Guiraud, Jean; 1866-1953. | 1909 | French | Renaissance |
| L'èglise Russe Et L'èglise Catholique: Lettres Du R.P. Rozaven de La Compagnie de Jèsus. | Rozaven; R.P. (Jean Louis de Leissègues de); 1772-1851. | 1876 | French | Russkadiba pravoslavnadiba dtbserkov' |
| L'èglise Russe Et L'immaculèe Conception | Gagarin, J. (Jean); 1814-1882. | 1876 | French | Immaculate Conception |
| Lehrbuch Der Katholischen Glaubens-Und Sittenlehre Für Die Oberen Klassen Der Höheren Lehranstalten Oesterreichs | Martin, Konrad. | 1859 | German | Catholic Church |
| Lehrbuch Des Deutschen Kirchenrechtes | Mejer, Otto; 1818-1892. | 1869 | German | Ecclesiastical law |
| Lehrbuch Des Katholischen Und Evangelischen Kirchenrechts: Mit Besonderer Rücksicht Auf Deutsche Zustände | Richter, Aemilius Ludwig; 1808-1864. | 1886 | German | Canon law |
| Lehre Vom Glauben | Wilmers, W. (Wilhelm); 1817-1899. | 1865 | German | Faith |
| Lendemains D'encyclique | 1908 | French | Modernism | |
| Leo XIII | Spahn, Martin. | 1905 | German | Popes |
| Leo XIII and Anglican Orders | Halifax, Charles Lindley Wood; Viscount; 1839-1934. | 1912 | English | Anglican orders |
| Leo XIII and Modern Civilization | Miller, J. Bleecker; (John Bleecker); 1856-1922. | 1897 | English | Church and social problems |
| Leo XIII. Als Retter Der Gesellschaftlichen Ordnung: Vortrag | Herzog, Eduard; 1841-1924. | 1888 | German | Papacy |
| Leo XIII: Seine Weltanschauung Und Seine Wirksamkeit | Goetz, Leopold Karl; 1868-1931. | 1899 | German | Leo |
| Lèon XIII D'après Ses Encycliques | Arros, Jean d'. | 1902 | French | Encyclicals, Papal |
| Lèon XIII Intime | Narfon, Julien de; 1863-1919. | 1902 | French | Popes |
| Leonis XIII P.M. Carmina, Inscriptiones, Numismata: Mit Genehmigung Sr. Heiligkeit: Vollstàndige Ausgabe Mit Einleitung Und Anmerkungen | Leo; XIII; Pope; 1810-1903. | 1903 | Latin | |
| Les Actes Des Martyrs de L'eglise Copte: Ètude Critique | Amèlineau, E. (Emile); 1850-1915. | 1890 | French | Christian martyrs |
| Les Actes Des Martyrs de L'egypte: Tirès Des Manuscrits Coptes de La Bibliothèque Vaticane Et Du Musèe Borgia: Texte Copte Et Traduction Francìaise Avec Introduction Et Commentaires | 1886 | Coptic | Christian martyrs | |
| Les Assemblèes Du Clergè Et Le Jansènisme | Bourlon, I. | 1909 | French | Jansenists |
| Les Conditions Du Retour Au Catholicisme: Enqueìte Philosophique Et Religieuse | Rifaux, Marcel. | 1907 | French | Catholic Church |
| Les Critères Thèologiques | Di Bartolo, Salvatore. | 1889 | French | Catholic Church |
| Les Dernières Persècutions Du Troisième Siècle (Gallus, Valèrien, Aurèlien) | Allard, Paul; 1841-1916. | 1907 | French | Persecution |
| Les Doctrines Modernistes: Lettre Encyclique de Notre Saint-père Le Pape Pie X A Tous Les Eveìques de L'univers Catholique. | 1907 | French | Modernism | |
| Les Doctrines Romaines Sur Le Libèralisme: Envisagèes Dans Leurs Rapports Avec Le Dogme Chrètien Et Avec Les Besoins Des Sociètès Modernes | Ramière, H. (Henri); 1821-1884. | 1870 | French | Liberalism (Religion) |
| Les Droits Du Saint-Siège: Alexandre Vi Et Cèsar Borgia: Ètude Historique Et Politique | La Rochelle, E. | 1861 | French | Papacy |
| Les Èlections Èpiscopales Dans L'eglise de France Du Ixe Au XiIe Siècle: Ètude Sur La Dècadence Du Principe Èlectif, 814-1150 | Imbart de La Tour, Pierre; 1860-1925. | 1891 | French | Election law (Canon law) |
| Les Faux Libèraux de L'eglise Romaine: Rèponse Au P. Perraud Et À Ses Adhèrents | Michaud, E. (Eugène); 1839-1917. | 1872 | French | Popes |
| Les Grands Convertis: M. Paul Bourget, M. J.-K. Huysmans, M. Brunetière, M. Coppèe | Sageret, Jules; b. 1861. | 1906 | French | Catholic converts |
| Les Jèsuites Et L'universitè | Gènin, F. (Francìois); 1803-1856. | 1844 | French | Jesuits |
| Les Lettres A La Cour Des Papes: Extraits Des Archives Du Vatican Pour Servir A L'histoire Littèraire Du Moyen-Age 1290-1423 | 1884 | Latin | Popes | |
| Les Litanies de La Sainte Vierge: Ètude Historique Et Critique | De Santi, Angelo. | 1900 | French | Catholic Church |
| Les Martyrs D'aubenas: Le Père Jacques Salès Et Le Frère Guillaume Saultemouche, Les Deux Premiers Martyrs de La Compagnie de Jèsus En France, 7 Fèvrier 1593 | Blanc, Jules. | 1906 | French | Christian martyrs |
| Les Martyrs, Ou, Le Triomphe de La Religion Chrètienne | Chateaubriand, Francìois-Rènè; vicomte de; 1768-1848. | 1870 | French | Christian martyrs |
| Les Modernistes: Notes D'histoire Religieuse Contemporaine | Sabatier, Paul; 1858-1928. | 1909 | French | Modernism |
| Les Nations Catholiques Et Les Nations Protestantes: Comparèes Sous Le Triple Rapport Du Bien-Eìtre, Des Lumières Et de La Moralitè | Roussel, Napolèon; 1805-1878. | 1854 | French | Protestantism |
| Les Origines Du Culte Des Martyrs | Delehaye, Hippolyte; 1859-1941. | 1912 | French | Christian martyrs |
| Les Rèordinations: Ètude Sur Le Sacrement de L'ordre | Saltet, Louis. | 1907 | French | Ordination |
| Les Thèories de M. Loisy: Exposè Et Critique | Lepin, Marius; b. 1870. | 1908 | French | Modernism |
| L'etat Pontifical Après Le Grand Schisme: Ètude de Gèographie Politique | Guiraud, Jean; 1866-1953. | 1896 | French | Papal States |
| Lettera Pastorale Di Monsig. Luigi Filippi: Vescovo D'aquila Al Clero Della Sua Diocesi Sulle Due Costituzioni Dommatiche Pubblicate Nella Sessione III. E IV. Del Concilio Vaticano. | 1871 | Italian | Catholic Church | |
| Lettere de Benedetto XIV Al Cononico Pier Francesco Peggi Bolognese (1729-1758): Publicate Insieme Col Diario Del Conclave Del 1740 | Benedict; XIV; Pope; 1675-1758. | 1888 | Italian | Popes |
| Lettere Di Un Prete Modernista: Appendice Dalla Sospensione Di R. Murri Alla Scomunica Di A. Loisy. | Prete modernista. | 1908 | Italian | Modernism |
| Letters From Rome on the Council | Dòllinger, Johann Joseph Ignaz von; 1799-1890. | 1870 | English | Popes |
| Letters From Rome on the Council | Dòllinger, Johann Joseph Ignaz von; 1799-1890. | 1870 | English | Popes |
| Letters From Rome on the Occasion of the Oecumenical Council, 1869-1870 | Mozley, T. (Thomas); 1806-1893. | 1891 | English | Vatican Council |
| Letters of Archbishop Ullathorne | Ullathorne, William Bernard; 1806-1889. | 1892 | English | Ullathorne, William Bernard |
| Letters of John Hus, The | Hus, Jan; 1369?-1415. | 1904 | English | Christian martyrs |
| Letters on the Gallican Church, Forwarded to the Rt. Rev. John Williams, D.D., LL.D., Presiding Bishop, &c. by the Bishop of Tennessee | 1887 | English | Old Catholic Church | |
| Letters to a Prebendary: Being an Answer to Reflections on Popery, by the Rev. J. Sturges...With Remarks on the Opposition of Hoadlyism to the Doctrines of the Church of England | Milner, John; 1752-1826. | 1810 | English | Catholics |
| Letters to His Holiness Pope Pius X | Sullivan, William; 1872-1935. | 1911 | English | Modernism |
| Letters to M. Gondon: (Author of Mouvement Religieux En Angleterre, Conversion de Cent Cinquante Ministres Anglicans, Traduction de L'histoire Du Dèveloppement de La Doctrine Chrètienne) on the Destructive Character of the Church of Rome | Wordsworth, Christopher; 1807-1885. | 1848 | English | Wordsworth, Chr |
| Letters to the Rt. Rev. John Hughes, Roman Catholic Bishop of New York | Kirwan; 1802-1861. | 1891 | English | Papacy |
| Lettre Pastorale de Monseigneur L'èveque de Tournay À L'occasion de Son Voyage A Rome Et de La Proclamation Du Dogme de L'immaculèe Conception de La Très-Sainte Vierge | 1855 | French | Labis, Gaspar Joseph | |
| Lettres de Saint Francìois-Xavier: De La Compagnie de Jèsus. Apotre Des Indies Et Du Japon, Traduites Sur L'èdition Latine de Bologne | Francis Xavier; Saint; 1506-1552. | 1855 | French | Catholic Church |
| L'eucharistie: Des Origines À Justin Martyr | Goguel, Maurice; 1880-1955. | 1910 | French | Lord's Supper |
| L'èvangile Et L'eglise | Loisy, Alfred Firmin; 1857-1940. | 1904 | French | Theology, Doctrinal |
| L'èvolution de La Foi Catholique | Hèbert, Marcel; 1851-1916. | 1905 | French | Faith |
| L'evolution Intellectuelle de Saint Augustin. I; Du Manichèisme Au Nèoplatonisme | Alfaric, Prosper; 1876-1955. | 1918 | French | Augustine |
| Life and Letters of Frederick William Faber, D.D: Priest of the Oratory of St. Philip Neri, The | Bowden, John Edward; 1829-1874. | 1869 | English | Faber, Frederick William |
| Life and Letters of Paul Seigneret: Seminarist of Saint Sulpice: (Shot at Belleville, Paris, May 26th, 1871) | Directeur du sèminaire de Saint-Sulpice. | 1875 | English | Catholics |
| Life and Letters of St. Francis Xavier, The | Coleridge, Henry James; 1822-1893. | 1872 | English | Francis Xavier |
| Life and Life-Work of Pope Leo XIII: Vicar of Jesus Christ and Bishop of Rome, Successor of St. Peter Prince of the Apostles, Supreme Pontiff of the Universal Church, Patriarch of the West, Primate of Italy, Archbishop and Metropolitan of..., The | McGovern, James J. (James Joseph); 1839-1914. | 1903 | English | Popes |
| Life and Miracles of St. William of Norwich, The | Thomas; of Monmouth. | 1896 | Latin | William |
| Life and Pontificate of Leo the Tenth, The | Roscoe, William; 1753-1831. | 1876 | English | Popes |
| Life and Times of Bishop Challoner (1691-1781), The | Burton, Edwin H. (Edwin Hubert); 1870-1925. | 1909 | English | Challoner, Richard |
| Life and Times of Hildebrand: Pope Gregory VII, The | Mathew, Arnold Harris; 1852-1919. | 1910 | English | Popes |
| Life and Times of Robert Grosseteste, Bishop of Lincoln, The | Perry, George G. (George Gresley); 1820-1897. | 1871 | English | Grosseteste, Robert |
| Life and Times of Rodrigo Borgia, Pope Alexander VI, The | Mathew, Arnold Harris; 1852-1919. | 1912 | English | Alexander |
| Life and Times of Sixtus the Fifth, The | Hùbner, Joseph Alexander; Baron de; 1811-1892. | 1872 | English | Popes |
| Life in the Roman World of Nero and St. Paul | Tucker, T. G. (Thomas George); 1859-1946. | 1910 | English | Rome |
| Life Inside the Church of Rome | Cusack, Mary Francis; 1829-1899. | 1890 | English | Catholic Church |
| Life of Cardinal Manning, Archbishop of Westminster | Purcell, Edmund Sheridan; 1824-1899. | 1896 | English | Manning, Henry Edward |
| Life of Gregory the Seventh: Preceded by a Sketch of the History of the Papacy to the Eleventh Century | Villemain; M. (Abel-Francìois); 1790-1870. | 1874 | English | Popes |
| Life of His Holiness Pope Pius X: Together With a Sketch of the Life of His Venerable Predecessor, His Holiness Pope Leo XIII: Also a History of the Conclave Giving a Full Account of the Rites and Ceremonies Connected With the Election of... | 1904 | English | Popes | |
| Life of Leo XIII. and History of His Pontificate: From Official and Approved Sources | Furey, Francis T. (Francis Thomas); b. 1852. | 1903 | English | Popes |
| Life of Leo XIII: From an Authentic Memoir Furnished by His Order: Written With the Encouragement, Approbation and Blessing of His Holiness the Pope: The Complete Life of the Venerable Father | O'Reilly, Bernard; 1823-1907. | 1903 | English | Popes |
| Life of Louis Claude de Saint-Martin, the Unknown Philosopher: And the Substance of His Transcendental Doctrine, The | Waite, Arthur Edward; 1857-1942. | 1901 | English | Saint-Martin, Louis Claude de |
| Life of Monseigneur Dupanloup: Bishop of Orleans | Lagrange, F. (Francìois); 1827-1895. | 1885 | English | Dupanloup, Félix |
| Life of Mother Frances Mary Teresa Ball: Foundress in Ireland of the Institute of the Blessed Virgin Mary, The | Coleridge, Henry James; 1822-1893. | 1881 | English | Catholics |
| Life of Mother Margaret Mary Hallahan: Foundress of the English Congregation of St. Catherine of Siena of the Third Order of St. Dominic | 1869 | English | Catholics | |
| Life of Mother Mary of Jesus: Emilia D'oultremont Baroness D'hooghvorst, 1818-1878, The | Suau, Pierre. | 1913 | English | Mary of Jesus |
| Life of Mrs. Mary D. James, The | James, J. H. (Joseph H.) | 1886 | English | James, Mary Dagworthy Yard |
| Life of Pope Pius IX: And the Great Events in the History of the Church During His Pontificate | Shea, John Dawson Gilmary; 1824-1892. | 1878 | English | Pius IX |
| Life of Ramon Monsalvatge: A Converted Spanish Monk of the Order of the Capuchins; With an Introduction by Robert Baird., The | Monsalvatge, Ramon; b. 1815. | 1845 | English | Protestant converts |
| Life of Saint Boniface: Archbishop of Mayence and Apostle of Germany, The | Cox, George W. (George William); 1827-1902. | 1853 | English | Boniface |
| Life of Saint Columba or Columbkille | Adamnan; Saint; 625?-704. | 1881 | English | Columba |
| Life of Saint Dominick: Preceded by a Memorial to the French People for the Restoration of the Order of Preachers in France, The | Lacordaire, Henri-Dominique; 1802-1861. | 1851 | English | Dominic |
| Life of Saint Margaret of Cortona, The | Giovagnoli, Antonio Francesco. | 1858 | English | Margherita |
| Life of St. Anselm: Archbishop of Canterbury: A Contribution to a Knowledge of the Moral, Ecclesiastical, andLiterary Life of the Eleventh and Twelfth Centuries, The | Mòhler, Johann Adam; 1796-1838. | 1842 | English | Anselm |
| Life of St. Francis of Assisi | Sabatier, Paul; 1858-1928. | 1899 | English | Francis |
| Life of St. Hugh of Avalon: Bishop of Lincoln: With Some Account of His Predecessors in the See of Lincoln, The | Perry, George G. (George Gresley); 1820-1897. | 1879 | English | Hugh |
| Life of St. Ignatius of Loyola, The | Genelli, Christoph; 1800-1850. | 1917 | English | Ignatius |
| Life of St. Ignatius, Founder of the Society of Jesus, The | Bouhours, Dominique; 1628-1702. | 1840 | English | Ignatius |
| Life of St. Laurence O'toole, Archbishop of Dublin (1128-1180) | Legris, A. (Albert) | 1914 | English | Laurence O'Toole |
| Life of St. Patrick and His Place in History, The | Bury, J. B. (John Bagnell); 1861-1927. | 1905 | English | Patrick |
| Life of William Waynflete: Bishop of Winchester, Lord High Chancellor of England in the Reign of Henry VI., and Founder of Magdalen College, Oxford, The | Chandler, Richard; 1738-1810. | 1811 | English | Waynflete, William |
| L'immacolata Concezione Di Maria Vergine E La Chiesa Greca Ortodossa Dissidente | Marini, Niccolò; 1843-1923. | 1908 | Italian | Immaculate Conception |
| L'immacolata Davanti Al Razionalismo | Beninati, Giuseppe. | 1880 | Italian | Immaculate Conception |
| L'immacolata Nel Secolo XIX: Panegirico Detto Nella Cattedrale Di Andria Il Dì 8 Dicembre 1876 | Magno, Giuseppe. | 1877 | Italian | Immaculate Conception |
| L'immaculèe Conception de La Bienheureuse Vierge Marie Considèrèe Comme Dogme de Foi | Malou, J. B. | 1857 | French | Immaculate Conception |
| L'immaculèe Conception de La Très-Sainte Vierge | Maurel, F. A. (F. Antoine); 1803-1874. | 1866 | French | Immaculate Conception |
| L'immaculèe Conception: Ètudes Sur L'origine D'un Dogme | Stap, A. | 1869 | French | Immaculate Conception |
| L'immaculèe Conception: Histoire D'un Dogme Catholique-Romain Ou Comment L'hèrèsie Devient Un Dogme | Pressensè, Edmond de; 1824-1891. | 1855 | French | Immaculate Conception |
| L'immaculèe Conception: Poème Didactique En L'honneur de La Sainte Vierge | Debouge, Xavier. | 1855 | French | Immaculate Conception |
| L'infaillibilitè Du Pape Et Le Syllabus: Ètude Historique Et Thèologique | Viollet, Paul; 1840-1914. | 1904 | French | Popes |
| L'infaillibilitè Papale Prise En Manifeste Et Flagrant Dèlit de Mensonge, Ou, Le Dogme de L'immaculèe Conception Citè Et Condamnè Au Tribunal de L'histoire Et Des Pères: Examen de Quelques Assertions de La Bulle Ineffabilis Deus… | Durand, Louis. | 1859 | French | Immaculate Conception |
| L'intolèrance Religieuse Et La Politique | Bouchè-Leclercq, Auguste; 1842-1923. | 1911 | French | Persecution |
| Litanei Zur Wunderthätigen Mutter Gottes Maria in Einsiedeln: Nebst Einem Gebete Und Anbefehlung: Zum Gebrauche Wallfahrtender Pilgerimme Und Des Christlichen Volkes. | 1869 | German | Mary | |
| Little Office of Our Lady: A Treatise Theoretical, Practical, and Exegetical, The | Taunton, Ethelred L. (Ethelred Luke); 1857-1907. | 1903 | English | Mary |
| Lives of St. Joseph Calasanctius, Founder of the Pious Schools, and of the Blessed Ippolito Galantini, Founderof the Congregation of Christian Doctrine;, The | 1850 | English | Catholics | |
| Lives of the Deceased Bishops of the Catholic Church in the United States: With an Appendix and an Analytical Index | Clarke, Richard H. (Richard Henry); 1827-1911. | 1888 | English | Bishops |
| Lives of the Early Popes | Meyrick, Thomas. | 1878 | English | Popes |
| Lives of the Popes, The | Platina; 1421-1481. | 1888 | English | Popes |
| Lord Acton and His Circle | Acton, John Emerich Edward Dalberg Acton; Baron; 1834-1902. | 1906 | English | Catholic authors |
| L'origine Des Menses Dans Le Temporel Des Èglises Et Des Monastères de France Au Ixe Siècle | Lesne, Emile; b. 1870. | 1910 | French | Church property |
| Los Vom Ultramontanismus!: An Herrn Dr. Albert Fritsch Auf Seine Schrift, Sechsundfünfzig Preis-Aufgaben Für Protestanten in Öffentlichen Briefen an Meinen Freund Max, Protestantischen Pfarrer Zu X: Eine of fene Antwort | Bötticher, Wilhelm. | 1899 | German | Protestantism |
| Lourdes: A History of Its Apparitions and Cures | Bertrin, Georges; 1851-1924. | 1908 | English | Lourdes (France) |
| Lourdes: Its Inhabitants, Its Pilgrims and Its Miracles: With an Account of the Apparitions at the Grotto and a Sketch of Bernadette's Subsequent History | Clarke, Richard F. (Richard Frederick); 1839-1900. | 1888 | English | Mary |
| Love Affairs of the Vatican, or, The Favourites of the Popes, The | Rappoport, A. S. (Angelo Solomon); 1871-1950. | 1912 | English | Popes |
| Loyola and Jesuitism in Its Rudiments | Taylor, Isaac; 1787-1865. | 1849 | English | Ignatius |
| Lucretia Borgia: According to Original Documents and Correspondence of Her Day | Gregorovius, Ferdinand; 1821-1891. | 1908 | English | Borgia, Lucrezia |
| Luris Processualis Compendium | Roberti, Francesco. | 1917 | Latin | Procedure (Canon law) |
| Luther's 95 Thesen Und Ihre Dogmenhistorischen Voraussetzungen | Bratke, Eduard; 1861-1906. | 1884 | German | Indulgences |
| Madame Louise de France | La Brière, Leon de; b. 1845. | 1907 | English | Catholics |
| Madonna in Legend and History, The | Vincent, Elizabeth C. (Elizabeth Carter) | 1899 | English | Mary |
| Magicon: Wonderful Prophecies Concerning Popery and Its Impending Overthrow and Fall, Together With Predictions Relative to America, the End of the World and the Formation of the New Earth: Also, Concerning the True Beginning and Future of… | Paulus; Dr. | 1869 | English | Prophecies (Occultism) |
| Magnum Oecuminicum Constantiense Concilium: De Universali Ecclesiae Reformatione, Unione, Et Fide. VI. Tomis Comprehensum...Ex Ingenti Antiquissimorum & Fide Dignissimorum Msctorum Mole...Erutum Ac Recensitum Multisq: Figuris Seneis… | 1697 | Latin | ||
| Malleus Haereticorum: Das Ist, Römisch-Katholische Briefe Zur Gründlichen Abfertigung Der Schrecklich Um Sich Greifenden Altkatholischen Ketzerei. | 1872 | German | Old Catholicism | |
| Man Mirroring His Maker: The Priest of God's Church | 1908 | English | Priests | |
| Manual of Controversy: Containing Grounds of the Catholic Doctrine, Fifty Reasons Why the Roman Catholic Religion Ought to Be Preferred to All Others, the Papist Misrepresented and Truly Represented., The | 1876 | English | Catholic Church | |
| Manual of the Holy Catholic Church: Embracing, First Part, the Beautiful Teachings of the Holy Catholic ChurchSimplified and Explained in the Form of Questions and Answers: Second Part, Light From the Altar, or, The True Catholic in the…, The | 1906 | English | Catholic Church | |
| Manuel Du Missionnaire Sèculier Ou Règulier: Et Du Pasteur Ordinaire Appelè A Coopèrer A L'oeuvre Des Missions Et Des Retraites | Nampon, Adrien; 1809-1869. | 1861 | French | Catholic Church |
| Mariä Verkündigung: Ein Kommentar Zu Lukas 1, 26-38 | Bardenhewer, Otto; 1851-1935. | 1905 | German | Mary |
| Marie Dans L'eglise Antènicèenne | Neubert, Eberhard. | 1908 | French | Mary |
| Mariolatry, New Phases of an Old Fallacy | Ganss, Henry G. (Henry George); 1855-1912. | 1897 | English | Mary |
| Mariology: A Dogmatic Treatise on the Blessed Virgin Mary, Mother of God: With an Appendix on the Worship of the Saints, Relics and Images | Pohle, Joseph; 1852-1922. | 1914 | English | Mary |
| Martyrs Omitted by Foxe: Being Records of Religious Persecutions in the Sixteenth and Seventeenth Centuries | Caufeild; Miss. | 1870 | English | Christian martyrs |
| Mary Immaculate, Mother of God, or, Devotions in Honour of the Blessed Virgin Mary | Kinane, T. H. (Thomas H.) | 1878 | English | Mary |
| Mary Magnifying God: May Sermons | Humphrey, William; 1839-1910. | 1873 | English | Mary |
| Mary Queen of Scots, 1542-1587: Extracts From the English, Spanish, and Venetian State Papers, Buchanan, Knox, Lesley, Melville, the "Diurnal of Occurrents", Nau, &c. | 1900 | English | Mary | |
| Mary the Virgin: As Commemorated in the Church of Christ | Seabury, Samuel; 1801-1872. | 1868 | English | Mary |
| Mary, Help of Christians: And the Fourteen Saints Invoked as Holy Helpers: Instructions, Legends, Novenas and Prayers: With Thoughts of the Saints Forevery Day in the Year | Hammer, Bonaventure; 1842-1917. | 1909 | English | Fourteen holy helpers |
| Mary, Queen of Scots: From Her Birth to Her Flight Into England: A Brief Biography: With Critical Notes, a Few Documents Hitherto Unpublished, and an Itinerary | Fleming, David Hay; 1849-1931. | 1898 | English | Mary |
| Mary, the Handmaid of the Lord | Charles, Elizabeth Rundle; 1828-1896. | 1865 | English | Mary |
| Mary, the Queen of the House of David and Mother of Jesus: The Story of Her Life | Walsh, A. Stewart; (Alexander Stewart); 1841-1918. | 1888 | English | Mary |
| Mary's Instructions to the Servants at Cana | 1863 | English | Mary | |
| Mater Admirabilis, or, First Fifteen Years of Mary Immaculate | Monnin, Alfred; 1823-1886. | 1865 | English | Mary |
| Mater Admirabilis: A Hand Book of Instruction on the Power and Prerogatives of Our Blessed Lady | O'Brien, C. (Cornelius); 1843-1906. | 1882 | English | Mary |
| Medici Popes: Leo X. and Clement VII., The | Vaughan, Herbert M. (Herbert Millingchamp); 1870-1948. | 1908 | English | Popes |
| Medieval Papacy: And Other Essays, The | Beet, William Ernest; b. 1869. | 1914 | English | Papacy |
| Medievalism: A Reply to Cardinal Mercier | Tyrrell, George; 1861-1909. | 1908 | English | Modernism |
| Mèditations Sur La Vie de L'apòtre Saint Pierre: Prèchèes Dans Le Temple de Divonne (ain) Fèvrier Et Mars 1872 | Werner, Eugène. | 1872 | French | Peter |
| Medula Theologiae Dogmaticae | Hurter, H. (Hugo); 1832-1914. | 1889 | Latin | Theology, Doctrinal |
| Meine Conversion: Ein Stück Seelen-Und Zeitgeschichte | Daumer, Georg Friedrich; 1800-1875. | 1859 | German | Catholic Church |
| Memoire Pour Mm. Les Èveìques, Missionnaires, & Directeurs Du Sèminaire Des Missions Ètrangères, Contre M. L'archeveì‚ Que de Paris | 1776 | French | Catholic Church | |
| Memoirs | Pattison, Mark; 1813-1884. | 1885 | English | Oxford movement |
| Memoirs of Missionary Priests: And Other Catholics of Both Sexes That Have Suffered Death in England on Religious Accounts From the Year 1577 to 1684 | Challoner, Richard; 1691-1781. | 1874 | English | Catholics |
| Memoirs of Zi Pre | Dunne, Edmund M. (Edmund Michael); 1864-1929. | 1914 | English | Catholic Church |
| Memorie Politiche Sui Conclavi Da Pio VII A Pio IX: Compilate Su Documenti Diplomatici Segreti | Cipolletta, Eugenio. | 1863 | Italian | Popes |
| Menus Propos D'un Catholique Libèral | Chaine, Lèon; b. 1851. | 1908 | French | Liberalism (Religion) |
| Method of Theology: And Other Essays., The | 1901 | English | Catholic Church | |
| Mexico in Transition: From the Power of Political Romanism to Civil and Religious Liberty | Butler, William; 1818-1899. | 1892 | English | Protestants |
| Mgr. L'èveìque D'orlèans Et Mgr. L'archevqìue de Malines | Gratry, A. (Auguste); 1805-1872. | 1870 | French | Popes |
| Miracles of Our Lady Saint Mary, The | 1906 | English | Mary | |
| Misa Nueva Para El Dia de La Inmaculada Concepcion de Marìa Santìsima Y Su Octava | 1874 | Spanish | Immaculate Conception, Feast of the | |
| Mission of St. Augustine to England According to the Original Documents: Being a Handbook for the Thirteenth Centenary, The | 1897 | English | Augustine | |
| Modern Objections Against the Catholic Church, the Pope and the Jesuits Answered: In Reply to R.W. Thompson, Secretary of the Navy | Weninger, F. X. (Francis Xavier); 1805-1888. | 1878 | English | Popes |
| Modern Psychology and Catholic Education | Pace, Edward A. | 1905 | English | Catholic Church |
| Modernism | Sabatier, Paul; 1858-1928. | 1908 | English | Modernism |
| Modernism and Catholicism | McGiffert, Arthur Cushman; 1861-1933. | 1910 | English | Modernism |
| Modernism and the Religious Crisis in Italy | Luzzi, Giovanni; 1856-1946. | 1911 | English | Modernism |
| Modernism in Italy: Its Origin, Its Incentive, Its Leaders and Its Aims | Jordan, Louis Henry; 1855-1923. | 1909 | English | Modernism |
| Modernism: A Record and Review | Lilley, A. Leslie; (Alfred Leslie); 1860-1948. | 1908 | English | Modernism |
| Modernisme Et Tradition Catholique En France | Guignebert, Charles; 1867-1939. | 1908 | French | Modernism |
| Modernist, The | Rickaby, Joseph; 1845-1932. | 1908 | English | Modernism |
| Mois de Marie Des Prèdicateurs, Ou, Cours Complet de Sermons, Confèrences, Instructions Pour Les Jours Du Mois de Marie, Pour Toutes Les Feìtes: Et Sur Tous Les Sujets Se Rapportant À La Très Sainte Vierge: Accompagnès de Riches | 1893 | French | Mary | |
| Mois de Marie: Vertus--titres--dèvotions--prières: Suivi D'un Choix de Textes Tirès Des Saints Pères Et Docteurs: Pouvant Servir de Nouveaux Sujets de Mèditations Pour Tous Les Jours Du Mois de Mai | Lefebvre, Al. (Alexis) | 1880 | French | Mary |
| Monasteries and Religious Houses of Great Britain and Ireland: With an Appendix on the Religious Houses in America | Steele, Francesca M. (Francesca Maria) | 1903 | English | Monasticism and religious orders |
| Monasticism: Its Ideals and History; and, the Confessions of St. Augustine | Harnack, Adolf von; 1851-1930. | 1913 | English | Monasticism and religious orders |
| Monseigneur Mermillod on the Supernatural Life: Being Conferences Delivered, in Retreat, to the Ladies of Lyon | Mermillod, Gaspard; 1824-1892. | 1874 | English | Spiritual life |
| Month of Mary for the Use of Ecclesiastics, The | Renaudet, E. | 1900 | English | Mary |
| Monument to the Glory of Mary: Litany of the Most Holy Virgin: Accompanied With Meditations | Barthe, Edouard; b. 1802. | 1871 | English | Mary |
| Monumenta Gregoriana | Gregory; VII; Pope; 1015-1085. | 1865 | Latin | Gregory |
| Monumenta Vaticana Historiam Ecclesiasticam Saeculi XVI Illustrantia: Ex TabularIIs Sanctae Sedis Apostolicae Secretis | 1861 | Italian | Catholic Church | |
| Morality of Tractarianism: A Letter From One of the People to One of the Clergy., The | Drane, Augusta Theodosia; 1823-1894. | 1850 | English | Oxford movement |
| Mortu sic Proprio of Pope Pius X: Dated June 29, 1910 i.e., Sept. 1, 1910, The | Pius; X; Pope; 1835-1914. | 1910 | English | Modernism |
| Mother of Jesus in Holy Scripture: Biblical-Theological Addresses, The | Schaefer, Aloys; 1853-1914. | 1913 | English | Mary |
| Mother of Jesus: In the First Age and After, The | Williams, J. Herbert. | 1906 | English | Mary |
| My Campaign in Ireland: Catholic University Reports and Other Papers | Newman, John Henry; 1801-1890. | 1896 | English | Catholic University of Ireland |
| Mysteries of the Vatican, or, Crimes of the Papacy, The | Griesinger, Theodor; 1809-1884. | 1864 | English | Papacy |
| Mystic Treasures of the Holy Mass, The | Coppens, Charles; 1835-1920. | 1905 | English | Mass |
| Mystical Contemplation, or, The Principles of Mystical Theology | Lamballe, E. | 1913 | English | Contemplation |
| Narratives of Early Maryland, 1633-1684 | 1910 | English | Maryland | |
| Narratives of Scottish Catholics Under Mary Stuart and James VI: Now First Printed From the Original Manuscripts in the Secret Archives of the Vatican and Other Collections | 1889 | English | Catholics | |
| Nature and Force of the Canon Law, The | Collins, William Edward; 1867-1911. | 1898 | English | Canon law |
| Necessity of Defending Our Common School System Against the Aggression of Roman Catholic Priests, The | 1870 | English | Religion in the public schools | |
| Neuvaine Et Litanies En L'honneur de L'immaculèe Conception | Religieux franciscain. | 1879 | French | Immaculate Conception |
| New Article of Faith and the Consequent Position of the Church of Rome, The | 1855 | English | Immaculate Conception | |
| New Month of Mary, or, Reflections for Each Day of the Month, on the Different Titles Applied to the Holy Mother of God in the Litany of Loretto: Principally Designed for the Month of May, The | Kenrick, Peter Richard; 1806-1896. | 1871 | English | Mary |
| New Reformation: Recent Evangelical Movements in the Roman Catholic Church, The | Bain, John A. | 1906 | English | Catholic Church |
| New Romish Dogma of the Immaculate Conception, or, Trial of the Church of Rome: Before a Jury of Roman Catholics on a Charge of Imposing on the Consciences of Christian People "A Yoke Which Neither We Nor Our Fathers Were Able to Bear", The | Maguire, Edward. | 1855 | English | Immaculate Conception |
| Newman Catholique: D'après Des Documents Nouveaux | Thureau-Dangin, Paul; 1837-1913. | 1912 | French | Newman, John Henry |
| Newman, Pascal, Loisy and the Catholic Church | Williams, W. J. | 1906 | English | Newman, John Henry |
| Nicolai LancicII de Praestantia Instituti Societatis Jesu | Lancicius, Nicolaus; 1574-1652. | 1890 | Latin | Jesuits |
| Notes on the Divine Office, Historical and Mystical: From Ancient and Modern Sources. | 1877 | English | Divine office | |
| Notes on the Papal Claims | Brinckman, Arthur; Chaplain of St. Saviour's Hospital. | 1910 | English | Papacy |
| Notes on the Rubrics of the Roman Ritual: Regarding the Sacraments in General, Baptism, the Eucharist, and Extreme Unction | O'Kane, James; Rev. | 1867 | English | Catholic Church |
| Notes on the Second Plenary Council of Baltimore | Smith, S. (Sebastian); 1845-1895. | 1874 | English | Canon Law |
| Notice Biographique Sur Le R. P. Newman de L'oratoire de Saint-Philippe de Nèri | Gondon, Jules. | 1853 | French | |
| Notices Bibliographiques Sur Les Archives Des Èglises Et Des Monastères de L'èpoque Carolingienne | Giry, Arthur; 1848-1899. | 1901 | French | Archives |
| Notices of the English Colleges & Convents Established on the Continent After the Dissolution of Religious Houses in England | Petre, Edward; 1794-1853. | 1849 | English | Catholic universities and colleges |
| Notre Dame de Lourdes Et L'immaculèe-Conception: À L'usage Du Clergè Et Des Laiques Instruits | Hilaire; t.-r. p. | 1880 | French | Immaculate Conception |
| Notre Dame Du Laus Et La Vènèrable Soeur Benoite: D'après Les Manuscrits Authentiques: Conservès Au Pieux Sanctuaire. | 1895 | French | Rencurel, Benoîte | |
| Novelties of Romanism: In Three Parts, I. Development of Doctrines, II. Chronological Arrangement, III. Old and New Creeds Contrasted, The | Collette, Charles Hastings; 1816-1901. | 1860 | English | Catholic Church |
| Novene Zu Unserer Lieben Frau Von Lourdes | Meschler, M. (Moritz); 1830-1912. | 1880 | German | Mary |
| Nuovi Studi Sulla Questione Di Papa Liberio | Savio, Fedele. | 1909 | Italian | Papacy |
| Occasional Essays | Chatard, Francis Silas; 1834-1918. | 1894 | English | Catholic Church |
| Oecumenical Council and the Infallibility of the Roman Pontiff: A Pastoral Letter to the Clergy &c., The | Manning, Henry Edward; 1808-1892. | 1869 | English | Popes |
| Oecumenical Council: Without Scripture Precedent, a Presumptuous Pretence, and a Menace to the Liberties of All Churches and of All States: A Lecture, The | Dyer, William H. | 1869 | English | Catholic Church |
| Of the Five Wounds of the Holy Church | Rosmini, Antonio; 1797-1855. | 1883 | English | Catholic Church |
| Official Report | 1910 | English | Catholic Church | |
| Offizielle Aktenstücke Zu Dem Von Sr. Heiligkeit Dem Papste Pius IX. Nach Rom Berufenen Oekumenischen Concil. Zweite Sammlung | 1870 | German | Catholic Church | |
| Offizielle Aktenstücke Zu Dem Von Sr. Heiligkeit Dem Papste Pius IX. Nach Rom Berufenen Oekumenischen Concil: Im Anhange, Die Coblenzer Laien Addresse. | 1869 | German | Catholic Church | |
| Old Brick Churches of Maryland, The | Ridgely, Helen West. | 1894 | English | Churches |
| Old Catholic Church: Or, The History, Doctrine, Worship, and Polity of the Christians: Traced From the Apostolic Age to the Establishment of the Pope as a Temporal Sovereign, A.D. 755, The | Killen, W. D. (William Dool); 1806-1902. | 1871 | English | Church history |
| Old Christianity Against Papal Novelties: Including a Review of Dr. Milner's "End of Controversy" | Ouseley, Gideon; 1762-1839. | 1852 | English | Milner, John |
| Old Church Life | 1900 | English | Christian antiquities | |
| Old Faith and the New Woman, The | Tyrrell, George; 1861-1909. | 1897 | English | Woman (Christian theology) |
| Old Service Books of the English Church, The | Wordsworth, Chr. (Christopher); 1848-1938. | 1904 | English | Catholic Church |
| Oldest Church Manual Called the Teaching of the Twelve Apostles Didacheì Toìn Doìdeka Apostolon: The Didachè and Kindred Documents in the Original: With Translations and Discussions of Post-Apostolic Teaching, Baptism, Worship, and..., The | Schaff, Philip; 1819-1893. | 1885 | English | Church polity |
| On Papal Infallibility: Opportune or Inopportune?: What Do You Think of It? | Weninger, F. X. (Francis Xavier); 1805-1888. | 1870 | English | Popes |
| On Prayer and the Contemplative Life | Thomas; Aquinas, Saint; 1225?-1274. | 1914 | English | Prayer |
| On Romanism | Bennett, William J. E. (William James Early); 1804-1886. | 1867 | English | Papacy |
| On the Apostolical and Infallible Authority of the Pope, When Teaching the Faithful: And on His Relation to a General Council | Weninger, F. X. (Francis Xavier); 1805-1888. | 1868 | English | Popes |
| On the Early History of the Doctrine of the Holy Spirit: With Especial Reference to the Controversies of the Fourth Century | Swete, Henry Barclay; 1835-1917. | 1873 | English | Holy Spirit |
| On the Encyclical Satis Cognitum | 1896 | English | Christian union | |
| On What Are Modern Papal Claims Founded? | Browne, G. F. (George Forrest); 1833-1930. | 1897 | English | Popes |
| Opus Evangelicum | Wycliffe, John; d. 1384. | 1895 | Latin | Papacy |
| Orations | Gavazzi; Father; (Alessandro); b. 1809. | 1851 | English | Papacy |
| Organization of the Early Christian Churches: Eight Lectures Delivered Before the University of Oxford, in theYear 1880: On the Foundation of the Late Rev. John Bampton, M.A. Canon of Salisbury, The | Hatch, Edwin; 1835-1889. | 1881 | English | Church polity |
| Origin and Early History of Christianity in Britain: From Its Dawn to the Death of Augustine, The | Gray, Andrew; D.D. | 1897 | English | Great Britain |
| Origin of the Lord's Supper: A Historical Inquiry, The | Gardner, Percy; 1846-1937. | 1893 | English | Lord's Supper |
| Our Attitude Towards English Roman Catholics and the Papal Court | Galton, Arthur; 1852-1921. | 1902 | English | Anglican Communion |
| Our Faith and Its Defenders: Comprising the Trials and Triumphs of the Defenders of Our Faith in America | Shea, John Dawson Gilmary; 1824-1892. | 1894 | English | Catholic Church |
| Our Inheritance: An Account of the Eucharistic Service in the First Three Centuries | Baring-Gould, S. (Sabine); 1834-1924. | 1888 | English | Lord's Supper |
| Our Lady's Dowry: How England Gained That Title | Bridgett, T. E. | 1890 | English | Mary |
| Outlook of Freedom, or, The Roman Catholic Element in American History, The | Fulton, Justin D. (Justin Dewey); 1828-1901. | 1856 | English | Catholic Church |
| Oxford and Cambridge Conferences. Second Series, 1900-1901 | Rickaby, Joseph; 1845-1932. | 1902 | English | Theology |
| Oxford Church Movement: Sketches and Recollections, The | Wakeling, G. d. 1895. | 1895 | English | Oxford movement |
| Oxford High Anglicanism and Its Chief Leaders | Rigg, James H. (James Harrison); 1821-1909. | 1899 | English | Oxford movement |
| Oxford Movement in America, or, Glimpses of Life in an Anglican Seminary, The | Walworth, Clarence A. (Clarence Augustus); 1820-1900. | 1895 | English | Oxford movement |
| Oxford Movement: Twelve Years, 1833-1845, The | Church, Richard William; 1815-1890. | 1891 | English | Oxford movement |
| Pabst Calixt II. I. Theil; Vorgeschichte | Maurer, Markus. | 1886 | German | Callistus |
| Pagan and Christian Rome | Lanciani, Rodolfo Amedeo; 1847-1929. | 1895 | English | Christian antiquities |
| Papacy and Modern Times: A Political Sketch, 1303-1870, The | Barry, William Francis; 1849-1930. | 1911 | English | Papacy |
| Papacy and Schism: Strictures on Mr. Ffoulkes' Letter to Archbishop Manning, The | Bottalla, Paul; 1823-1896. | 1869 | English | Popes |
| Papacy in the 19th Century: A Part of "the History of Catholicism Since the Restoration of the Papacy", The | Nippold, Friedrich. | 1900 | English | Papacy |
| Papacy, Socialism and Democracy | Leroy-Beaulieu, Anatole; 1842-1912. | 1892 | English | Sociology, Christian (Catholic) |
| Papacy: Its Historic Origin and Primitive Relations With the Eastern Churches, The | Guettèe; abbè; (Wladimir); 1816-1892. | 1867 | English | Papacy |
| Papacy: Its History, Dogmas, Genius, and Prospects: Being the Evangelical Alliance First Prize Essay on Popery, The | Wylie, J. A. (James Aitken); 1808-1890. | 1852 | English | Popes |
| Papacy: The Idea and Its Exponents, The | Krùger, Gustav; b. 1862. | 1909 | English | Papacy |
| Papal Claims and Anglican Orders, The | Sandford, C. W. (Charles Waldegrave); 1828-1903. | 1897 | English | Anglican orders |
| Papal Conclaves, The | Pennington, Arthur Robert. | 1897 | English | Popes |
| Papal Conclaves: As They Were and as They Are, The | Trollope, T. Adolphus; (Thomas Adolphus); 1810-1892. | 1876 | English | Popes |
| Papal Conquest: Italy's Warning - Wake Up, John Bull!, The | Robertson, Alexander; 1846-1933. | 1909 | English | Catholic Church |
| Papal Conspiracy Exposed, and Protestantism Defended, in the Light of Reason, History, and Scripture, The | Beecher, Edward; 1803-1895. | 1855 | English | Catholic Church |
| Papal Controversy Involving the Claim of the Roman Catholic Church to the Church of God, The | 1892 | English | Papacy | |
| Papal Infallibility Untenable: Three Letters | Gratry, A. (Auguste); 1805-1872. | 1870 | English | Popes |
| Papal Monarchy: From St. Gregory the Great to Boniface VIII (590-1303), The | Barry, William Francis; 1849-1930. | 1902 | English | Papacy |
| Papal System: From Its Origin to the Present Time: A Historical Sketch of Every Doctrine, Claim and Practice of the Church of Rome, The | Cathcart, William; 1826-1908. | 1872 | English | Catholic Church |
| Papalism Versus Catholic Truth and Right | Spencer, Jesse Ames; 1816-1898. | 1896 | English | Catholic Church |
| Papism in the XIX Century in the United States: Being Select Contributions to the Papal Controversy During 1835-40 | Breckinridge, Robert Jefferson; 1800-1871. | 1841 | English | Catholic Church |
| Papst Alexander IV | Tenckhoff, Franz. | 1907 | German | Popes |
| Papst Gregor IX | Felten, Joseph; 1851-1929. | 1886 | German | Popes |
| Papst Honorius III., 1216-1227: Eine Monographie | Clausen, J. | 1895 | German | Popes |
| Papst Honorius IV. | Pawlicki, Bernhard. | 1896 | German | Popes |
| Papst Johannes XXI. I. Abschnitt; das Vorleben Des Papstes: Eine Monographie | Stapper, R. | 1898 | German | Popes |
| Papst Julius II. Und Die Gründung Des Kirchenstaates | Brosch, Moritz; 1829-1907. | 1878 | German | Papal States |
| Papst Leo XILL. Und Der Protestantismus | Brecht, Theodor. | 1888 | German | Leo |
| Papst Pius IX. and Seine Zeit | Stepischnegg, Jakob Maximilian. | 1879 | German | Pius |
| Papst Pius X: Ein Bild Kirchlicher Reformtätigkeit | Hoch, Alexander. | 1907 | German | Popes |
| Papst Pius X: Ein Lebensbild Des Heiligen Vaters | De Waal, Anton; 1837-1917. | 1903 | German | Popes |
| Papsttum Und Kirchenreform. Erster Band: Vier Kapitel Zur Geschichte Des Ausgehenden Mittelalters | Haller, Johannes; 1865-1947. | 1903 | German | Papacy |
| Papsttum Und Reformation Im Mittelalter 1143-1517 | Thudichum, Friedrich von; 1831-1913. | 1903 | German | Papacy |
| Papstwahl Und Ausgleich: Eine Antwort Auf Die Frage, Culturkampf Oder Friede in Staat Und Kirche? | Zorn, Ph. | 1878 | German | Popes |
| Parish Life in Mediaeval England | Gasquet, Francis Aidan; Cardinal; 1846-1929. | 1906 | English | Catholic Church |
| Parochial School History and Its Fallacies: Hibernian Oratory Punctured | Editor of The American citizen. | 1896 | English | Irish |
| Parochial School Question: An Open Letter to Bishop Keane, Rector of the New Catholic University, at Washington, D.C., The | Irish Catholic layman. | 1890 | English | Catholic Church |
| Parochial School: A Curse to the Church, a Menace to the Nation: With an Appendix Which Deals With the Separate or Parochial School in Canada, The | Crowley, Jeremiah J. b. 1861. | 1905 | English | Catholic schools |
| Passing Protestantism and Coming Catholicism | Smyth, Newman; 1843-1925. | 1908 | English | Modernism |
| Path Which Led a Protestant Lawyer to the Catholic Church, The | Burnett, Peter H. (Peter Hardeman); 1807-1895. | 1860 | English | Protestantism |
| Paul the Mystic: A Study in Apostolic Experience | Campbell, James M. (James Mann); 1840-1926. | 1908 | English | Mysticism |
| Per Crucem Ad Lucem: Lettres Pastorales, Discours, Allocutions, Etc. | Mercier, Dèsirè; 1851-1926. | 1917 | French | Catholic Church |
| Per Il XX. Concilio Ecumenico MDCCCIXIX: Appello Ai Parrochi, Canonici, Professori E Moderatori Dei Seminari, E Sacerdoti Italiani. | 1882 | Italian | Catholic Church | |
| Persecution in the Early Church: A Chapter in the History of Renunciation | Workman, Herbert B. (Herbert Brook); b. 1862. | 1906 | English | Persecution |
| Persecution of Diocletian: A Historical Essay, The | Mason, Arthur James; 1851-1928. | 1876 | English | Persecution |
| Peter Von Ailli (Petrus de Alliaco): Zur Geschichte Des Grossen Abendländischen Schisma Und Der Reformconcilien Von Pisa Und Constanz | Tschackert, Paul. | 1877 | German | Schism, The Great Western, 1378-1417 |
| Petit Office de L'immaculèe Conception de La Très-Sainte Vierge | 1874 | French | Immaculate Conception | |
| Petri BallerinII Presbyteri Veronensis de Vi Ac Ratione Primatus Romanorum Pontificum Et de Ipsorum Infallibilitate in Definiendis ControversIIs Fidei Liber Singularis: In Quo Utrumque Deducitur Et Constituitur Ex PrincipIIs Concessis Ab... | Ballerini, Pietro; 1698-1769. | 1849 | Latin | Popes |
| Petri Lombardi Libri IV Sententiarum | Peter Lombard; Bishop of Paris; ca. 1100-1160. | 1916 | Latin | Catholic Church |
| Petri Privilegium: Three Pastoral Letters to the Clergy of the Diocese | 1871 | English | Popes | |
| Petrus Stirbt Nicht!: Gedanken Über Die Unzerstörbarkeit Des Felsen Petri: Aus Anlass Des Fünfundzwanzigsten Jahres Der Thronbesteigung Sr. Heiligkeit Papst Leo XIII | Mörzinger, Johann. | 1902 | German | Papacy |
| Pfalzgraf Philipp Ludwig Von Neuburg, Sein Sohn Wolfgang Wilhelm Und Die Jesuiten: Ein Bild Aus Dem Zeitalter Der Gegenreformation | Sperl, August; 1862-1926. | 1895 | German | Counter-Reformation |
| Pie IX Est-Il Infaillible: L'infaillibilitè Du Pape Devant La Raison Et L'ècriture Les Papes Et Les Conciles, Les Pères Et Les Thèologiens, Les Rois Et Les Empereurs | Weninger, F. X. (Francis Xavier); 1805-1888. | 1869 | French | Popes |
| Pietas Mariana Britannica: A History of English Devotion to the Most Blessed Virgin Marye Mother of God: With a Catalogue of Shrines, Sanctuaries, Offerings, Bequests, and Other Memorials of the Piety of Our Forefathers | Waterton, Edmund. | 1879 | English | Mary |
| Pilgrim, or, Truth and Beauty in Catholic Lands, The | 1853 | English | Christian poetry, English | |
| Pioneer Catholic History of Oregon | O'Hara, Edwin V. (Edwin Vincent); 1881-1956. | 1911 | English | Catholic Church |
| Pius IX Und Die Katholische Kirche in Deutschland: Mit Besonderer Berücksichtigung Des Hermesianismus | Stupp, Hermann Joseph; d. 1870. | 1848 | German | Pius |
| Pius the Seventh, 1800-1823 | Allies, Mary H. (Mary Helen); 1852-1927. | 1897 | English | Popes |
| Pius X. | Sentzer, Bonifaz. | 1908 | German | Popes |
| Plain Facts for Fair Minds: An Appeal to Candor and Common Sense | Searle, George M. (George Mary); 1839-1918. | 1906 | English | Catholic Church |
| Plain Lectures on the Growth of the Papal Power | Robertson, James Craigie; 1813-1882. | 1876 | English | Papacy |
| Plain Reasons Against Joining the Church of Rome | Littledale, Richard Frederick; 1833-1890. | 1892 | English | Catholic Church |
| Plutòt La Mort Que Le Dèshonneur: Appel Aux Anciens Catholiques de France Contre Les Rèvolutionnaires Romanistes | Michaud, E. (Eugène); 1839-1917. | 1872 | French | Old Catholicism |
| Poems, Charades, Inscriptions of Pope Leo XIII: Including the Revised Compositions of His Early Life in Chronological Order: With English Translation and Notes | Leo; XIII; Pope; 1810-1903. | 1902 | English | Henry, H. T |
| Points of Controversy: A Series of Lectures | Smarius, C. F. | 1867 | English | Catholic Church |
| Political Romanism, or, The Secular Policy of the Papal Church | Hughey, G. W. (George Washington); b. 1832. | 1872 | English | Popes |
| Polity of the Christian Church of Early, Mediaeval, and Modern Times, The | Pelliccia, Alessio Aurelio. | 1883 | English | Church polity |
| Poor Man's Catechism, or, The Christian Doctrine Explained: With Suitable Admonitions., The | 1815 | English | Catholic Church | |
| Pope and the Council, The | Dòllinger, Johann Joseph Ignaz von; 1799-1890. | 1870 | English | Papacy |
| Pope Gregory the Great and His Relations With Gaul | Kellett, F. W. | 1889 | English | Popes |
| Pope Honorius Before the Tribunal of Reason and History | Bottalla, Paul; 1823-1896. | 1868 | English | Popes |
| Pope Leo XIII: His Life and Letters, From Recent and Authentic Sources: Together With Useful, Instructive, and Entertaining Information Required by All Roman Catholic People Throughout the World | Talbot, James F. | 1886 | English | Popes |
| Pope, or President?: Startling Disclosures of Romanism as Revealed by Its Own Writers: Facts for Americans. | 1858 | English | Catholic Church | |
| Pope, the Kings and the People: A History of the Movement to Make the Pope Governor of the World by a Universal Reconstruction of Society From the Issue of the Syllabus to the Close of the Vatican Council, The | Arthur, William; 1819-1901. | 1903 | English | Catholic Church |
| Pope: Considered in His Relations With the Church, Temporal Sovereignties, Separated Churches, and the Cause of Civilization, The | Maistre, Joseph Marie; comte de; 1753-1821. | 1850 | English | Popes |
| Popery and Infidelity | Douglas, James; of Cavers. | 1852 | English | Catholic Church |
| Popery and Its Aims: A Tract for the Times | Moody, Granville; 1812-1887. | 1871 | English | Catholic Church |
| Popery in Power, or, The Spirit of the Vatican: To Which Is Added, Priestcraft, or, The Monarch of the Middle Ages: A Drama | Turnley, Joseph. | 1850 | English | Catholic Church |
| Popery!: as It Was and as It Is; Also, Auricular Confession and Popish Nunneries | Hogan, William; ca. 1790-1848. | 1854 | English | Catholic Church |
| Popery, a Deceiver of Souls: A Lecture | Fisk, George. | 1850 | English | Catholic Church |
| Popery, a Helper of Infidelity: A Lecture | Fisk, George. | 1850 | English | Catholic Church |
| Popery, a Hinderance to Spirituality: A Lecture | Fisk, George. | 1850 | English | Catholic Church |
| Popery, a Restless Tyrant: A Lecture | Fisk, George. | 1850 | English | Catholic Church |
| Popery, an Enslaver of Nations: A Lecture | Fisk, George. | 1850 | English | Papacy |
| Popery, Foredoomed of God: A Lecture | Fisk, George. | 1851 | English | Catholic Church |
| Popery, Subversive of Morality. Part II: A Lecture | Fisk, George. | 1850 | English | Confession |
| Popery: Its Character and Its Crimes | Tayler, William Elfe. | 1851 | English | Papacy |
| Popery: The Man of Sin and the Son of Perdition: Being a Prize Essay of the Evangelical Alliance | Gault, Robert. | 1855 | English | Popes |
| Popes and the Hohenstaufen, The | Balzani, Ugo; conte; 1847-1916. | 1888 | English | Hohenstaufen, House of |
| Popish Antichrist: His Character and Doom as Delineated in 2 Thess. II. 1-12, The | Smyth, John. | 1848 | English | Papacy |
| Populärsymbolik, Oder, Vergleichende Darstellung Der Glaubensgegensätze Zwischen Katholiken Und Protestanten Nach Ihren Bekenntnissschriften | Buchmann, J. (Jacob); b. 1805 or 6. | 1850 | German | Protestantism |
| Port Royal: A Contribution to the History of Religion and Literature in France | Beard, Charles; 1827-1888. | 1861 | English | Jansenists |
| Port-Royal Et Magny: Fondation de L'abbaye, La Rèforme, Les Solitaires, Les Petites Ècoles, Le Jansènisme, L'augustinus, Les Cinq Propositions, Le Formulaire, Destruction Du Monastère, Les Ruines, Les Corps Et Les Tombes de L'èglise | Finot, Ed. | 1888 | French | Jansenists |
| Power of the Pope During the Middle Ages, or, An Historical Inquiry Into the Origin of the Temporal Power of the Holy See, and the Constitutional Laws of the Middle Ages Relating to the Deposition of Sovereigns: With an Introduction, on..., The | Gosselin; M. 1787-1858. | 1853 | English | Popes |
| Practical Catechist, The | Nist, Jakob; b. 1859. | 1913 | English | Catholic Church |
| Practical Handbook for the Study of the Bible and of Bible Literature: Including Biblical Geography, Antiquities, Introduction to the Old and New Testament, and Hermeneutics | Seisenberger, Michael; 1832-1911. | 1911 | English | Catholic Church |
| Prècis Du Mouvement Catholique-Libèral Dans Le Jura Bernois, 1873-1874 | Deramey, J.-P. | 1875 | French | Liberalism (Religion) |
| Predigten Über Die Lauretanische Litanei: Mit Einem Anhange, Zwei Predigten Über Die Unbefleckte Empfängniss Der Seligsten Jungfrau Maria | Binder, Mathäus; 1822-1893. | 1878 | German | Immaculate Conception |
| Priest and Nun | Wright, Julia McNair; 1840-1903. | 1869 | English | Catholic Church |
| Priest, the Woman, and the Confessional, The | Chiniquy, Charles Paschal Telesphore; 1809-1899. | 1884 | English | Confession |
| Priest: A Tale of Modernism in New England, The | Sullivan, William; 1872-1935. | 1911 | English | |
| Priesthood in the English Church: A Study of the Vindication of the Bull Apostolicae Curae. | 1898 | English | Anglican orders | |
| Priests and People in Ireland | McCarthy, Michael J. F. (Michael John Fitzgerald) | 1902 | English | Catholic Church |
| Priest's Studies, The | Scannell, Thomas B. (Thomas Bartholomew); 1854-1917. | 1908 | English | Theology |
| Primacy of the Apostolic See Vindicated, The | Kenrick, Francis Patrick; 1796-1863. | 1855 | English | Popes |
| Primitive Church and the Primacy of Rome, The | Bartoli, Giorgio. | 1909 | English | Popes |
| Primitive Church and the See of Peter, The | Rivington, Luke; 1838-1899. | 1894 | English | Popes |
| Probestücke Eines Katechismus Für Die Lateinschule: Mit Einer Einleitung Über Die Aufgabe Der Religionslehre Und Ihre Lösung an Der Gymnasien | Matha Hiltensberger, Johann von. | 1861 | German | Religion in the public schools |
| Professor Townsend's Review of Judge Fallon's Minority Report: An Address Delivered in Music Hall, Boston, Sunday, June 1, 1890: Also, Appendixes, Containing Documentary Proof of the Condemnation of Public Schools by Roman Catholic Eccliasti | Townsend, L. T. (Luther Tracy); 1838-1922. | 1890 | English | Religion in textbooks |
| Programme of Modernism: A Reply to the Encyclical of Pius X, Pascendi Dominici Gregis, The | Buonaiuti, Ernesto; 1881-1946. | 1908 | English | Modernism |
| Progress of the Catholic Church in America: And the Great Columbian Catholic Congress of 1893. | 1897 | English | Catholic Church | |
| Proper Gift of the Christian Ministry, and the Sacramental Mode of Its Transmission, The | Richey, Thomas; d. 1905. | 1897 | English | Anglican orders |
| Prophecies, Miracles and Visions of St. Columba (Columcille): First Abbot of Iona, A.D. 563-597 | Adamnan; Saint; 625?-704. | 1895 | English | Columba |
| Protestantischer Schriftbeweis: Nebst Register Der Protestantischerseits Bestrittenen Lehren Roms Als Wegweiser in Den Konfessionellen Streitfragen | Herrmann, F. | 1906 | German | Catholic Church |
| Protestantism and Catholicity Compared in Their Effects on the Civilization of Europe | Balmes, Jaime Luciano; 1810-1848. | 1849 | English | Protestantism |
| Public Schools Must Go!: The Fiat Has Gone Forth From the Vatican., The | 1888 | English | Religion in the public schools | |
| Purple and Scarlet Woman and Her Relatives: A Book for the Times, The | King, A. B. (Albert Barnes); 1828-1914. | 1900 | English | Catholic Church |
| Purpose of the Papacy, The | Vaughan, John S. (John Stephen); 1853-1925. | 1910 | English | Papacy |
| Pusey and the Church Revival | Grafton, Charles C. (Charles Chapman); 1830-1912. | 1908 | English | Oxford movement |
| Puseyism Traced to Its Root: In a View of the Papal and Hierarchical System, as Compared With the Religion of the New Testament | Gurney, Joseph John; 1788-1847. | 1848 | English | Authority (Religion) |
| Quellen Zur Geschichte Des Investiturstreites | Bernheim, Ernst; 1850-1942. | 1907 | German | Investiture |
| Quellen Zur Geschichte Des Papsttums | Mirbt, Carl. | 1895 | Latin | Papacy |
| Quelques Lettres Sur Des Questions Actuelles Et Sur Des Èvènements Rècents | Loisy, Alfred Firmin; 1857-1940. | 1908 | French | Catholics |
| Question of Anglican Orders: In Respect to a "Vindication" of the Papal Decision, Which Was Drawn Up by the English Roman Catholic Bishops at the End of 1897, The | Bulgakov, Aḟanasiì† Ivanovich; 1859-1907. | 1899 | English | Anglican orders |
| Question of the Hour: The Bible and the School Fund, The | Clark, Rufus W. (Rufus Wheelwright); 1813-1886. | 1870 | English | Religion in the public schools |
| Questions D'histoire Et D'archèologie Chrètienne | Guiraud, Jean; 1866-1953. | 1906 | French | Christian antiquities |
| Quincenario Para Honrar À La Immaculada Concepcion Bajo El Tìtulo de Nuestra Señora de Lourdes: Va Precedido de Una Sucinta Historia de Las Apariciones Y Seguido de Un Trìduo de Accion de Gracias Por Los Favores Alcanzados de Tan Mise | Pallès, Josè. | 1880 | Spanish | Mary |
| Rational Religion | Conway, John. | 1890 | English | Catholic Church |
| Real St. Francis of Assisi, The | Robinson, Paschal. | 1904 | English | Francis |
| Reality of Romanism: A Survey and an Elucidation, The | Frohschammer, J. (Jakob); 1821-1893. | 1878 | English | Papacy |
| Reasons for Abjuring Allegiance to the See of Rome: A Letter to the Earl of Shrewsbury | Connelly, Pierce; 1804-1883. | 1852 | English | Catholic Church |
| Recent Discoveries Illustrating Early Christian Life and Worship: Three Lectures | Maclean, Arthur John; 1858-1943. | 1915 | English | Worship |
| Recollections of the Last Four Popes and of Rome in Their Times | Wiseman, Nicholas Patrick; 1802-1865. | 1858 | English | Pius |
| Records of the English Catholics of 1715 | 1889 | English | Catholic nonjurors | |
| Rede Über Das Neue Marien-Dogma Des Papstes Pius Ixten | Ronge, Johannes. | 1858 | German | Mary |
| Reform Der Römischen Kirche in Haupt Und Gliedern: Aufgabe Des Bevorstehenden Römischen Concils. | 1869 | German | Catholic Church | |
| Regard Due to the Virgin Mary: With an Examination of the New Roman Dogma: Two Lectures, The | Gallagher, Mason. | 1855 | English | Mary |
| Reginald Pole: Cardinal Archbishop of Canterbury: An Historical Sketch With an Introductory Prologue and Practical Epilogue | Lee, Frederick George; 1832-1902. | 1888 | English | Pole, Reginald |
| Religio Viatoris | Manning, Henry Edward; 1808-1892. | 1880 | English | Catholic Church |
| Religious and Social Position of Catholics in England: An Address, The | Wiseman, Nicholas Patrick; 1802-1865. | 1864 | English | Catholics |
| Religious Persecution: An Examination of Cardinal Manning's Letter in the New York Tribune, July 3, 1886 | Lee, John. | 1887 | English | Persecution |
| Religious Revolution of the Nineteenth Century, The | Quinet, Edgar; 1803-1875. | 1881 | English | Catholic Church |
| Religious State: The Episcopate and the Priestly Office, The | Thomas; Aquinas, Saint; 1225?-1274. | 1902 | English | Perfection |
| Remarks on the Encyclical of the 8th of December, A.D. 1864 | Dupanloup, Fèlix; 1802-1878. | 1865 | English | Catholic Church |
| Reminiscences: Chiefly of Oriel College and the Oxford Movement | Mozley, T. (Thomas); 1806-1893. | 1882 | English | Oxford movement |
| Rèponse de M. Chayssac: Cy-Devant Prestre Romain Forcìat Pour La Foy À Un Missionnaire de Marseille | Chayssac, M. | 1882 | French | Catholic Church |
| Revival of Priestly Life in the Seventeenth Century in France: A Sketch, The | Lear, H. L. Sidney. | 1873 | English | Oratorians |
| Rhythmi Et Carmina VarIIs E Monumentis Excerpta in Honorem Mariae Virginis Immaculatae: Anno Primi Eius Iubilaei MDCCCLXXIX. | 1879 | Latin | Mary | |
| Richard of Wyche: Labourer, Scholar, Bishop, and Saint (1197-1253) | Capes, Mary Reginald; b. 1849. | 1913 | English | Richard |
| Rise and Fall of Papacy, The | Fleming, Robert; 1660?-1716. | 1849 | English | Papacy |
| Rise of the Papacy, A.D. 385-461, The | Beet, William Ernest; b. 1869. | 1910 | English | Papacy |
| Ritorno Dei Dotti Protestanti Alla Chiesa Cattolica, Ossia, Xl Biografie Dedicate Al Popolo Romano | Rizzoli, Enrico. | 1871 | Italian | Catholic converts |
| Roads From Rome: A Series of Personal Narratives | 1903 | English | Catholic Church | |
| Roads to Rome: Being Personal Records of Some of the More Recent Converts to the Catholic Faith | 1901 | English | Catholic converts | |
| Robert Grosseteste, Bishop of Lincoln: A Contribution to the Religious, Political and Intellectual History of the Thirteenth Century | Stevenson, Francis Seymour; 1862- | 1899 | English | Grosseteste, Robert |
| Rom Und Babylon: Eine Beleuchtung Confessioneller Zustände Der Gegenwart | Brunner, Sebastian; 1814-1893. | 1852 | German | Protestantism |
| Rom Und Ravenna: Bis Zum 9. Jahrhundert: Ein Beitrag Zur Papstgeschichte | Luther, Paul; Dr. phil. | 1889 | German | Papacy |
| Roman Catholic Church and Free Thought: A Controversy Between Archbishop Purcell, of Cincinnati, and Thomas Vickers, Minister of the First Congregational Church of the Same City; Together With an Appendix, Containing the Encyclical Lette, The | Purcell; Archbishop; (John Baptist); 1800-1885. | 1868 | English | Catholic Church |
| Roman Catholic Church and the School Question, The | Mead, Edwin D. (Edwin Doak); 1849-1937. | 1888 | English | Religion in the public schools |
| Roman Catholic Church in Italy, The | Robertson, Alexander; 1846-1933. | 1903 | English | Catholic Church |
| Roman Catholic Opposition to Papal Infallibility | Sparrow-Simpson, W. J. (William John); 1859-1952. | 1909 | English | Popes |
| Roman Catholicism Capitulating Before Protestantism | Fradryssa, G. V. | 1908 | English | Popes |
| Roman Catholicism Scripturally Considered, or, The Church of Rome the Great Apostasy | Jones, Charles P. | 1856 | English | Catholic Church |
| Roman Catholicism, Old and New: From the Standpoint of the Infallibility Doctrine | Schulte, John; 1831-1898. | 1877 | English | Popes |
| Roman Court, or, A Treatise on the Cardinals, Roman Congregations and Tribunals, Legates, Apostolic Vicars, Protonotaries, and Other Prelates of the Holy Roman Church, The | Baart, Peter A. | 1895 | English | Catholic Church |
| Roman Index and Its Proceedings: A Second Letter to the Most Rev. Archbishop Manning, Etc., The | Ffoulkes, Edmund S. (Edmund Salusbury); 1819-1894. | 1869 | English | Ffoulkes, Edmund S |
| Roman Index of Forbidden Books: Briefly Explained for Catholic Booklovers and Students With a Summary of the Index, The | Betten, Francis S. (Francis Sales); b. 1863. | 1909 | English | Prohibited books |
| Roman Primacy, A.D. 430-451, The | Rivington, Luke; 1838-1899. | 1899 | English | Popes |
| Romance of Romanism: A Discovery and a Criticism, The | Frohschammer, J. (Jakob); 1821-1893. | 1878 | English | Papacy |
| Romanism | Bulfinch, S. G. (Stephen Greenleaf); 1809-1870. | 1849 | English | Catholic Church |
| Romanism and the Common Schools: A Discourse | Fish, Henry Clay; 1820-1877. | 1853 | English | Religion in the public schools |
| Romanism and the Republic: A Discussion of the Purposes, Assumptions, Principles and Methods of the Roman Catholic Hierarchy | Lansing, Isaac J. 1846-1920. | 1890 | English | Catholic Church |
| Romanism as It Is: An Exposition of the Roman Catholic System, for the Use of the American People | Barnum, Samuel W. (Samuel Weed); 1820-1891. | 1877 | English | Catholic Church |
| Romanism at Home: Letters to the Hon. Roger B. Taney, Chief Justice of the United States | Kirwan; 1802-1861. | 1852 | English | Kirwan |
| Romanism in America | Clark, Rufus W. (Rufus Wheelwright); 1813-1886. | 1855 | English | Papacy |
| Romanism in Its Home | Eager, John H. (John Howard); b. 1848. | 1899 | English | Catholic Church |
| Romanism in Russia:an Historical Study | Tolstoì†, Dmitrì„ì† A. (Dmitrì„ì† Andreevich); graf; 1823-1889. | 1874 | English | Catholic Church |
| Romanism in the Light of Prophecy and History: Its Final Downfall: And the Triumph of the Church of Christ | Brownlee, W. C. (William Craig); 1784-1860. | 1854 | English | Catholic Church |
| Romanism in the Light of the Gospel | Whately, E. J. (Elizabeth Jane); 1822-1893. | 1800 | English | Catholic Church |
| Romanism Not Christianity: A Series of Popular Lectures in Which Popery and Protestantism Are Contrasted, Showing the Incompatibility of the Former With Freedom and Free Institutions | Rice, N. L. (Nathan Lewis); 1807-1877. | 1847 | English | Catholic Church |
| Romanism Versus the Public School System | Dorchester, Daniel; 1827-1907. | 1888 | English | Catholic Church |
| Romanism, Protestantism, Anglicanism: Being a Layman's View of Some Questions of the Day, Together With Some Remarks on Dr. Littledale's Plain Reasons Against Joining the Church of Rome | Cruse, Francis. | 1883 | English | Littledale, Richard Frederick |
| Romanism, Tridentine and Vatican, Refuted, or, No End of Controversy in the Church of Rome: A Reply to Milner | Blakeney, R. P. (Richard Paul); 1820-1884. | 1873 | English | Milner, John |
| Romanism: A Doctrinal and Historical Examination of the Creed of Pope Pius IV | Jenkins, Robert C. (Robert Charles); 1815-1896. | 1882 | English | Catholic Church |
| Romanism: Its General Decline and Its Present Condition and Prospects in the United States | Mattison, Hiram; 1811-1868. | 1871 | English | Anti-Catholicism |
| Romanists Disqualified for Civil Power: Proved From the Decrees of the Council of Trent, and Other Authentic Documents of the Romish Church: A Tract for the Times | Taylor, W. F. Minister of Christ Church, Claughton. | 1851 | English | Catholic Church |
| Romanticism in Its Relations to Rome. Article I. Ways to Rome | Wharton, Francis; 1820-1889. | 1871 | English | Nippold, Friedrich |
| Rome and Education | Chiniquy, Charles Paschal Telesphore; 1809-1899. | 1881 | English | Catholic Church |
| Rome and England, or, Ecclesiastical Continuity | Rivington, Luke; 1838-1899. | 1896 | English | Continuity of the church |
| Rome and Italy at the Opening of the Å’cumenical Council: Depicted in Twelve Letters Written From Rome to a Gentleman in America | Pressensè, Edmond de; 1824-1891. | 1870 | English | Vatican Council |
| Rome and Reform | Oliphant, T. L. Kington. | 1902 | English | Protestantism |
| Rome and the Council in the Nineteenth Century | Bungener, Fèlix; 1804-1874. | 1870 | English | Papacy |
| Rome and the Newest Fashions in Religion: Three Tracts, the Vatican Decrees, Vaticanism, Speeches of the Pope | Gladstone, W. E. (William Ewart); 1809-1898. | 1875 | English | Popes |
| Rome and the Popes | Brandes, Karl; 1810-1867. | 1868 | English | Roman question |
| Rome En de Geschiedenis: Twee Verhandelingen Voor Roomsche Landgenooten | Bolland, Gerardus Johannes Petrus Josephus; 1854-1922. | 1897 | Dutch | Catholic Church |
| Rome Et L'eglise Syrienne-Maronite D'antioche (517-1531): Thèses, Documents, Lettres | 1906 | French | Maronites | |
| Rome From the Inside, or, The Priests' Revolt | 1899 | English | Catholic Church | |
| Rome Pendant Le Concile | Veuillot, Louis; 1813-1883. | 1872 | French | Catholic Church |
| Rome, Christian and Papal: Sketches of Its Religious Monuments and Ecclesiastical Hierarchy: With Notices of the Jesuits and the Inquisition | Sanctis, L. de; (Luigi); 1808-1869. | 1856 | English | Catholic Church |
| Rome's Attack on Our Public Schools | Brandt, John L. (John Lincoln); 1860-1946. | 1895 | English | Religion in the public schools |
| Romìische Briefe Vom Concil | Döllinger, Johann Joseph Ignaz von; 1799-1890. | 1870 | German | Popes |
| Römischer Schriftbeweis: Nebst Register | Herrmann, F. | 1906 | German | Catholic Church |
| Römisches Christentum in Kritischer Beleuchtung: Eine Praktische Antwort Auf Die Bisherigen Schmähwerke Roms Über Luther Und Die Evangelische Kirche | Schmidt, R. | 1906 | German | Catholic Church |
| Romish Doctrine of Intention: In an Unanswered Letter to the Roman Catholic Priests of Liverpool: An Appeal Thereupon to the Roman Catholics of Liverpool: And a Supplemental Letter, Addressed to the Editor of the Liverpool Standard, The | Minton, Samuel. | 1851 | English | Intention |
| Romish Doctrine of the Immaculate Conception Traced From Its Source, The | Preuss, Ed. (Edward); 1834-1904. | 1867 | English | Immaculate Conception |
| Roms Kampf Um Die Weltherrschaft: Eine Kirchengeschichtliche Studie | Schubert, Hans von; 1859-1931. | 1888 | German | Papacy |
| S. AurelII Augustini Confessiones | Augustine; Saint, Bishop of Hippo. | 1872 | Latin | Augustine |
| S. Francis de Sales: Bishop and Prince of Geneva | Lear, H. L. Sidney. | 1877 | English | Francis |
| S. Pietro in Roma Ed I Primi Papi: Secondo I Piuì€ Vetusti Cataloghi Della Chiesa Romana | Rinieri, Ilario; b. 1853. | 1909 | Italian | Papacy |
| Sacerdotalism in the Nineteenth Century: A Critical History | Sheldon, Henry C. (Henry Clay); 1845-1928. | 1909 | English | Priesthood |
| Sacramentals of the Holy Catholic Church, The | Lambing, Andrew Arnold; 1842-1918. | 1892 | English | Sacramentals |
| Sacrifice of the Eucharist, and Other Doctrines of the Catholic Church Explained and Vindicated, The | Garside, Charles B. (Charles Brierley); 1818-1876. | 1875 | English | Lord's Supper |
| Saint Alban the Martyr, Holborn: A History of Fifty Years | Russell, George William Erskine; 1853-1919. | 1913 | English | St. Alban the Martyr Church (Holborn, London, England) |
| Saint Anselme de Cantorbèry: Tableau de La Vie Monastique Et de La Lutte Du Pouvoir Spirituel Avec Le Pouvoir Temporel Au Onzième Siècle | Rèmusat, Charles de; 1797-1875. | 1868 | French | Anselm |
| Saint Augustin | Bertrand, Louis; 1866-1941. | 1914 | English | Augustine |
| Saint Augustine | Cutts, Edward Lewes; 1824-1901. | 1909 | English | Augustine |
| Saint Dominic | Guiraud, Jean; 1866-1953. | 1901 | English | Dominic |
| Saint Edmund, King and Martyr: A History of His Life and Times, With an Account of the Translations of His Incorrupt Body, Etc: From Original Mss. | Mackinlay, J. B. (James Boniface); b. 1853. | 1893 | English | Edmund |
| Saint Etienne Et Son Sanctuaire À Jèrusalem | Lagrange, Marie-Joseph; 1855-1938. | 1894 | French | Churches |
| Saint Francìois de Xavier de La Compagnie de Jèsus: Son Pays, Sa Famille, Sa Vie | Cros, L.-Jos.-Marie; (Lèonard-Joseph-Marie); 1831-1913. | 1903 | French | Francis Xavier |
| Saint Grègoire de Nazianze: Archeveìque de Constantinople Et Docteur de L'eglise: Sa Vie, Ses Oeuvres Et Son Èpoque | Benoit, A. (Alphonse); b. 1833. | 1884 | French | Gregory |
| Saint Gregory the Great | Howorth, Henry H. (Henry Hoyle); Sir; 1842-1923. | 1912 | English | Gregory |
| Saint Jerome | Largent, Augustin. | 1900 | English | Jerome |
| Saint Joseph: Èpoux de Marie, Père Nourricier de Jèsus, Patron de L'èglise: D'après L'ècriture Sainte Et La Tradition: Considèrations Thèologiques, Morales Et Historiques, Suivies D'un Plan de Mèditations Ou de Lectures Po | Mercier, V. (Victor) | 1895 | French | Joseph |
| Saint Louis and Calvin | Guizot; M. (Francìois); 1787-1874. | 1868 | English | Protestants |
| Saint Martin de Tours | Babut, E. Ch. (Ernest Ch.); 1875-1916. | 1912 | French | Martin |
| Saint Nicholas I | Roy, Jules. | 1901 | English | Papacy |
| Saint Patrick and the Western Apostolic Churches: Or, The Religion of the Ancient Britains and Irish Not Roman Catholic, and the Antiquity, Tenets and Sufferings of the Albigenses and Waldenses. | 1857 | English | Albigenses | |
| Saint Patrick in History | Shahan, Thomas J. (Thomas Joseph); 1857-1932. | 1904 | English | Patrick |
| Saint Victrice, Èveì‚ Que de Rouen (Ive-Ve S.) | Vacandard, E. (Elphège); 1849-1927. | 1903 | French | Victricius |
| Sainte Claire D'assise | Lèopold; de Chèrancè; 1838-1926. | 1911 | French | Clare |
| Saint-Martin, Le Philosophe Inconnu: Sa Vie Et Ses Ècrits, Son Maitre Martìnez Et Leurs Groupes D'après Des Documents Inèdits | Matter, Jacques; 1791-1864. | 1862 | French | Saint-Martin, Louis Claude de |
| Sakramente Und Sakramentalien in Den Drei Ersten Christlichen Jahrhunderten | Probst, Ferdinand; 1816-1899. | 1872 | German | Sacraments |
| Sammlung Der Aktenstücke Zum Ersten Vaticanischen Concil: Mit Einem Grundrisse Der Geschichte Desselben | Friedberg, Emil. | 1872 | German | Vatican Council |
| Sammlung Einiger Wichtigen of fiziellen Aktenstücke Zur Geschichte Der Emancipation Der Katholiken in England | 1835 | German | Catholic emancipation | |
| Sammlung Vermischter Schriften Über Kirchengeschichte Und Kirchenrecht | Fessler, Joseph; 1813-1872. | 1869 | German | Canon law |
| Sanctuaries and Sanctuary Seekers of Mediaeval England, The | Cox, J. Charles; (John Charles); 1843-1919. | 1911 | English | Asylum, Right of |
| Sanctum Florentinum Universae Ecclesiae Concilium | 1865 | Latin | Eugenikos, Markos | |
| Santa Maddalena Sofia Barat: All'ombra Del Vaticano (25 Ottobre 1832-14 Guigno 1851) | 1884 | Italian | Barat, Madeleine-Sofie | |
| Schematismus Der Geistlichkeit Des Bisthums Eichstàtt Fùr Das Jahr 1480: Programm Des Bischòflichen Lyceums in Eichstàtt | 1879 | Latin | Catholic Church | |
| Schulte Und Döllinger Gegen Das Concil: Kritische Beleuchtung Der Schulte'schen Broschüre Über Die Macht Der Päpste Und Der Jüngste Erklärung Döllingers | Scheeben, Matthias Joseph; 1835-1888. | 1871 | German | Popes |
| Schwenckfeld's Participation in the Eucharistic Controversy of the Sixteenth Century | Loetscher, Frederick William; b. 1874. | 1906 | English | Lord's Supper |
| Secret History of the Oxford Movement, The | Walsh, Walter; 1847-1912. | 1898 | English | Oxford movement |
| Secret Instructions of the Jesuits: Faithfully Translated From the Latin of an Old Genuine London Copy, With an Historical Sketch, &c. | 1857 | English | Jesuits | |
| Secrets of the Vatican, The | Sladen, Douglas Brook Wheelton; 1856-1947. | 1907 | English | Papacy |
| Sectarian Appropriations of Public Money and Public Property in the City of New York: Nearly $2,000,000 Taken From the Treasury in 1869, 1870 and 1871 | 1872 | English | Church schools | |
| See of Rome in the Middle Ages, The | Reichel, Oswald J. | 1870 | English | Papacy |
| Select Mediaeval Documents: And Other Material Illustrating the History of Church and Empire 754 A.D.-1254 A.D. | 1900 | Latin | Popes | |
| Selected Epistles of Gregory the Great, Bishop of Rome, Books IX-XIV | Gregory; I; Pope; ca. 540-604. | 1898 | English | Christian literature, Early |
| Sententia Sancti Thomae Aquinatis de Immunitate B.V. Dei Parentis a Peccati Originalis Labe | Cornoldi, Giovanni Maria; 1822-1892. | 1873 | Latin | Immaculate Conception |
| Sequel to Catholic Emancipation: The Story of the English Catholics Continued Down to the Re-establishment ofTheir Hierarchy in 1850, The | Ward, Bernard; 1857-1920. | 1915 | English | Catholic Church |
| Shall Liberty Die?, or, Patriots to the Front: A Biblical, and Historical, View of the Great Antichrist | Lucas, Elijah; b. 1828. | 1897 | English | Catholic Church |
| Shall Our Common School System Be Maintained as It Is? | Boole, W. H. | 1870 | English | Religion in the public schools |
| Shall Our Common Schools Be Destroyed?: An Argument Against Perverting the School Fund to Sectarian Uses | Thompson, Joseph Parrish; 1819-1879. | 1870 | English | Church schools |
| Shall Rome Reconquer England? | Horton, Robert F. (Robert Forman); 1855-1934. | 1910 | English | Catholic Church |
| Shortest Way to End Disputes About Religion: In Two Parts, The | Manning, R. (Robert) | 1853 | English | Catholic Church |
| Sibyllinische Blàtter | Diels, Hermann; 1848-1922. | 1890 | Greek | Sibyls |
| Simples Rèflexions Sur Le Dècret Du Saint-Office, Lamentabili Sane Exitu Et Sur L'encyclique, Pascendi Dominici Gregis | Loisy, Alfred Firmin; 1857-1940. | 1908 | French | Modernism |
| Six Lectures on the Oxford Movement: And Its Results on the Church of England | Cruttwell, Charles Thomas; 1847-1911. | 1899 | English | Oxford movement |
| Sketch of the Irish Code: Entitled "Laws to Prevent the Growth of Popery;" But Really Intended, and With Successful Effect, to Degrade, Debase, and Enslave the Roman Catholics of Ireland, and to Divest Them of Their Estates, With a Brief Notice of Some... | Carey, Mathew; 1760-1839. | 1823 | English | Catholic Church in Ireland |
| Sketch of the Romish Controversy. Part the First; Containing the Persecuting Principles of the Church of Rome,and the Corruptions of the Nicene Church in the Fourth Century and of the Church of Rome From the Fourth Century Until the Middle of the Six, The | 1850 | Latin | Catholic Church | |
| Sketch of the Romish Controversy. Part the Second; Containing Extracts From the Fathers, Extracts From the Roman Breviary, the Council of Trent, Etc., Explanatory of Romish Doctrines, and Miniature Controversial Sketches of Transubstantiation, the…, The | 1850 | Greek | Catholic Church | |
| Sketches of Illustrious Dominicans: St. Louis Bertrand, Julian Garces, Jerome de Loaysa | Touron, A. (Antoine); 1686-1775. | 1884 | English | Bertrand, Louis |
| Sketches of the Early Catholic Missions of Kentucky: From Their Commencement in 1787 to the Jubilee of 1826-7: Embracing a Summary of the Early History of the State, the Adventures of the First Catholic Emigrants, Biographical Notices of the... | Spalding, M. J. (Martin John); 1810-1872. | 1844 | English | Catholic Church |
| Sketches of the Establishment of the Church in New England | Fitton, James; 1805-1881. | 1872 | English | Catholics |
| So-Called Egyptian Church Order and Derived Documents, The | Connolly, R. H. (Richard Hugh); 1873-1948. | 1916 | English | Church orders, Ancient |
| Soldier of Christ, or, Talks Before Confirmation, The | Mary Loyola; Mother; 1845-1930. | 1904 | English | Confirmation |
| Soliloquium de Arrha Animae Und de Vanitate Mundi | Hugh; of Saint-Victor; 1096?-1141. | 1913 | Latin | Mysticism |
| Some Account of the Catholic Reform Movement in the Italian Church: To Which Is Added a Sketch of a Recent Tour in Lombardy and Venetia and Three Letters to the Rev. F. Meyrick, A.M. | Langdon, W. Chauncy; (William Chauncy) | 1868 | English | Church renewal |
| Some Great Catholics of Church and State | Kelly, Bernard W. (Bernard William); b. 1872. | 1909 | English | Catholics |
| Some Pages of Franciscan History | Robinson, Paschal. | 1906 | English | Francis |
| Somme Contre Le Catholicisme Libèral | Morel, Jules. | 1876 | French | Liberalism (Religion) |
| Soul's Orbit, or, Man's Journey to God, The | Petre, Maude Dominica; 1863-1942. | 1904 | English | Meditations |
| Souvenirs de Terre-Sainte | Gautier, Lucien; 1850-1924. | 1898 | French | Palestine |
| Specimen CalendarII Universalis Ecclesiae Pro Anno Bissestili MCMXII: Ad Normam Constitutionis Apost. "Divino Afflatu" SS. D.N. PII Papae X. | 1912 | Latin | Catholic Church | |
| Specimina Codicum Graecorum Vaticanorum | Kennedy, James; d. 1925. | 1889 | English | Paleography, Greek |
| Speculum Beatae Mariae Virginis | Conradus; de Brunopoli, Franciscan; d. 1279. | 1904 | Latin | Mary |
| Spicilegium Dogmatico-Biblicum, Seu, CommentarII in Selecta Sacrae Scripturae Loca Quae Ad Demonstranda Dogmata Adhiberi Solent: In Usum Praelectionum Et Conferentiarum Sacerdotalium | Corluy, Joseph; 1834-1896. | 1842 | Latin | Dogma |
| Spirit and Genius of St. Philip Neri, Founder of the Oratory: Lectures, The | Faber, Frederick William; 1814-1863. | 1850 | English | Neri, Filippo |
| Spirit of St. John of the Cross: Consisting of His Maxims, Sayings, and Spiritual Advice on Various Subjects;Translated From the Spanish by the Rev. Canon Dalton., The | John of the Cross; Saint; 1542-1591. | 1863 | English | Spiritual life |
| Spirit of the Papacy, The | Hittell, John S. (John Shertzer); 1825-1901. | 1895 | English | Papacy |
| Spiritual Letters of Archbishop Fènelon: Letters to Men, The | Fènelon, Francìois de Salignac de la Mothe-; 1651-1715. | 1898 | English | Meditations |
| Spiritual Struggles of a Roman Catholic: An Autobiographical Sketch | Beaudry, Louis N. (Louis Napolèon); 1833-1892. | 1875 | English | Catholics |
| Spiritual Works of Louis of Blois, Abbot of Liesse | Blois, Louis de; 1506-1566. | 1876 | English | Spiritual life |
| St. Aldhelm: His Life and Times: Lectures Delivered in the Cathedral Church of Bristol, Lent, 1902 | Browne, G. F. (George Forrest); 1833-1930. | 1903 | English | Aldhelm |
| St. Augustine: Aspects of His Life and Thought | Montgomery, W. (William); 1871-1930. | 1914 | English | Augustine |
| St. Birgitta: Die Nordische Prophetin Und Ordensstifterin: Ein Lebens Und Zeitbild Aus Dem Vierzehnten Jahrhundert | Hammerich, Frederik; 1809-1877. | 1872 | German | Bridget |
| St. Cyrille Et St. Mèthode: Première Lutte Des Allemands Contre Les Slaves, Avec Un Essai Sur Les Destinèes Du Glagol Et Un Mèmoire Sur L'alphabet, La Langue Et Le Rite Des Apòtres Slaves Au Ixe Siècle | Avril, Adolphe d'. | 1885 | French | Slavic countries |
| St. Edmund, Archbishop of Canterbury: His Life as Told by Old English Writers | 1903 | English | Edmund | |
| St. Francis of Assisi: Lessons From a Noble Life in Six Addresses | Oesterley, W. O. E. (William Oscar Emil); 1866-1950. | 1901 | English | Francis |
| St. Ignatius Loyola and the Early Jesuits | Rose, Stewart. | 1891 | English | Ignatius |
| St. Patrick Apostle of Ireland: A Memoir of His Life and Mission: With an Introductory Dissertation on Some Early Usages of the Church in Ireland, and Its Historical Position From the Establishment of the English Colony to the Present Day | Todd, James Henthorn; 1805-1869. | 1864 | English | Patrick |
| St. Peter in Rome and His Tomb on Vatican Hill | Barnes, Arthur Stapylton; 1861-1936. | 1900 | English | Peter |
| St. Peter Non-Roman in His Mission, Ministry, and Martyrdom | Maguire, Robert; 1826-1890. | 1871 | English | Popes |
| St. Peter, His Name and His Office | Allies, T. W. (Thomas William); 1813-1903. | 1895 | English | Popes |
| St. Vincent de Paul & the Vincentians in Ireland, Scotland, and England, A.D. 1638-1909 | Boyle, Patrick; b. 1849. | 1909 | English | Vincent de Paul |
| St. Vincent's Manual: Containing a Selection of Prayers and Devotional Exercises, Originally Prepared for the Use of the Sisters of Charity in the United States. | 1854 | English | Catholic Church | |
| State Papers Concerning the Irish Church in the Time of Queen Elizabeth | 1868 | English | Catholic Church | |
| Statutes of the Apostles, or, Canones Ecclesiastici, The | Hippolytus; Antipope; ca. 170-235 or 6. | 1904 | English | Church orders, Ancient |
| Stimmen Aus Der Katholischen Kirche Über Die Kirchenfragen Der Gegenwart | 1870 | German | Popes | |
| Storia Ed Esame Della Enciclica E Del Sillabo Dell' 8 Dicembre 1864 | Isaia, Antonino. | 1865 | Italian | Catholic Church |
| Story of St. Stanislaus Kostka, The | Coleridge, Henry James; 1822-1893. | 1877 | English | Kostka, Stanislas |
| Story of the Congress: A Record of Great Things Seen and Heard in Catholic London, Sept. 1908., The | 1909 | English | Eucharistic congresses | |
| Story of the Later Popes: From the Great Schism to the First Years of Pius X (1414-1906), The | Isaacson, Charles S. | 1906 | English | Papacy |
| Story of the Life of Pius the Ninth, The | Trollope, T. Adolphus; (Thomas Adolphus); 1810-1892. | 1877 | English | Popes |
| Story of the Old Catholic and Kindred Movements: Leading Up to a Union of National Independent Churches, The | Scarth, A. M. E. (Alice Mary Elizabeth); 1848-1889. | 1883 | English | Old Catholicism |
| Story of the Oxford Movement: A Book for the Times, The | Nye, G. H. F. (George Henry Frederick) | 1899 | English | Oxford movement |
| Studien Zur Geschichte Der Gesellschaft Jesu: Loyola… | Boehmer, Heinrich; 1869-1927. | 1914 | German | Ignatius |
| Studies and Teaching of the Society of Jesus at the Time of Its Suppression, 1750-1773, The | Maynard; abbè; (Ulysse); 1814-1893. | 1855 | English | Jesuits |
| Studies in Americanism: Father Hecker, Is He a Saint? | Maignen, Charles; b. 1858. | 1898 | English | Americanism (Catholic controversy) |
| Studies in Church History | Conway, Bertrand L. (Bertrand Louis); 1872-1959. | 1916 | English | Catholic Church |
| Studies in Modernism | Fawkes, Alfred; 1849 or 50-1930. | 1913 | English | Modernism |
| Studies in the Civil, Social and Ecclesiastical History of Early Maryland: Lectures | Gambrall, Theodore C. (Theodore Charles) | 1893 | English | Maryland |
| Studies of English Mystics: St. Margaret's Lectures, 1905 | Inge, William Ralph; 1860-1954. | 1906 | English | Mysticism |
| Stumbling-Blocks Made Stepping-Stones on the Road to the Catholic Faith | Moriarty, James J. (James Joseph); 1843-1887. | 1881 | English | Catholic Church |
| Substitute for Swinton, Romanized, The | 1888 | English | Religion in textbooks | |
| Succession of the Prelates and Members of the Cathedral Bodies in Ireland. Vol. III, the Province of Ulster, The | Cotton, Henry; 1789-1879. | 1849 | English | Church of Ireland |
| Succession of the Prelates and Members of the Cathedral Bodies in Ireland. Vol. IV, the Province of Connaught, The | Cotton, Henry; 1789-1879. | 1850 | English | Church of Ireland |
| Summa Doctrinae Christianae in Usum Docentium | Weninger, F. X. (Francis Xavier); 1805-1888. | 1844 | Latin | Catholic Church |
| Superstition in All Ages | Holbach, Paul Henri Thiry; baron d'; 1723-1789. | 1890 | English | Christianity |
| Supplementum Ad Tractatum de VII Decalogi Praecepto Secundum Jus Civile Gallicum | Aertnys, Jos. (Josef); 1828-1915. | 1889 | Latin | Marriage |
| Sursum, or, Sparks Flying Upward | Rawes, H. A. (Henry Augustus) | 1864 | English | Meditations |
| Syllabus for the People: A Review of the Propositions Condemned by His Holiness Pope Pius IX: With Text of theCondemned List, The | Monk. | 1875 | English | Catholic Church |
| Symbolik Der Römisch-Katholischen Kirche | Baier, A. H. | 1854 | German | Catholic Church |
| Synesius of Cyrene: Philosoher and Bishop | Gardner, Alice; 1854-1927. | 1886 | English | Synesius |
| Synod of Elvira and Christian Life in the Fourth Century: A Historical Essay, The | Dale, A. W. W. (Alfred William Winterslow); Sir; 1855-1926. | 1882 | English | Christian life |
| Synods in English: Being the Text of the Four Synods of Westminster, The | 1886 | English | Catholic Church | |
| Synopsis Papismi, or, A General View of the Papacy: With Confutations of Romish Errors From the Scriptures, Fathers, Councils, Etc. | Willet, Andrew; 1562-1621. | 1852 | English | Papacy |
| Synopsis Theologiae Dogmaticae Fundamentalis Ad Mentem S. Thomae Aquinatis Hodiernis Moribus Accommodata: De Verà Religione, de Ecclesià Christi, de Fontibus Theologicis | Tanquerey, Adolphe; 1854-1932. | 1897 | Latin | Catholic Church |
| Tagebuch, Während Des Vaticanischen Concils | Friedrich, J. (Johann); 1836-1917. | 1871 | German | Vatican Council |
| Teaching of Our Lord as to the Indissolubility of Marriage, The | Tyson, Stuart Lawrence; b. 1873. | 1909 | English | Marriage |
| Teaching of the Twelve Apostles | 1885 | Greek | Church polity | |
| Teaching of the Twelve Apostles | 1885 | English | Church polity | |
| Teaching Truth by Signs and Ceremonies, or, The Church, Its Rites and Services | Meagher, Jas. L. (James Luke); 1848-1920. | 1889 | English | Catholic Church |
| Temporal Power of the Pope: Containing the Speech of the Hon. Joseph Chandler, Delivered in the House of Representatives of the United States, January 11, 1855: With Nine Letters, Stating the Prevailing Roman Catholic Theory in the…, The | McClintock, John; 1814-1870. | 1855 | English | Popes |
| Ten Lectures on the Martyrs | Allard, Paul; 1841-1916. | 1907 | English | Christian martyrs |
| Tertulliani de Paenitentia Et de Pudicitia Recensio Nova | Tertullian; ca. 160-ca. 230. | 1915 | Latin | Penance |
| Textus Antenicaeni Ad Primatum Romanum Spectantes | 1914 | Latin | Papacy | |
| Theologia Dogmatica | Kenrick, Francis Patrick; 1796-1863. | 1858 | Latin | Theology, Doctrinal |
| Theologia Specialis. Pars Altera: Complectens Tractatus Tres: De Gratia, de Sacramentis Et de Deo Omnium Consummatore | Hurter, H. (Hugo); 1832-1914. | 1903 | Latin | Grace (Theology) |
| Theologia Specialis. Pars Prior: Complectens Disputationes Tres: De Deo Uno Et Trino, de Deo Creatore Et de Verbo Incarnato | Hurter, H. (Hugo); 1832-1914. | 1877 | Latin | Trinity |
| Theses de Ecclesia Christi: Opus Posthumum: Brevi Praemisso de Eiusdem Vita Commentario | Franzelin, Johannes Baptist; 1816-1886. | 1887 | Latin | Church |
| Thoughts for St. Luke's Day: In Three Chapters: With Hymns and Poems | La Fontaine, Rachel Adelaide. | 1893 | English | Luke |
| Thoughts on the Immaculate Conception | 1855 | English | Immaculate Conception | |
| Three-Quarters of a Century (1807 to 1882): A Retrospect | Thèbaud, Augustus J. 1807-1885. | 1904 | English | Catholic Church |
| Thrilling and Instructive Developments: An Experience of Fifteen Years as Roman Catholic Clergyman and Priest | Czechowski, Michael B. (Michael Belina); 1818-1876. | 1862 | English | Czechowski, Michael B |
| Timothy, or, Letters to a Young Theologian | Hettinger, Franz; 1819-1890. | 1902 | English | Pastoral theology |
| Tokens of the Hour: The Last Phases of the Papacy Marked in Prophecy | Ross, Albion. | 1885 | English | Papacy |
| Tombs of the Popes: Landmarks in Papal History, The | Gregorovius, Ferdinand; 1821-1891. | 1903 | English | Popes |
| Torquemada and the Spanish Inquisition: A History | Sabatini, Rafael; 1875-1950. | 1913 | English | Inquisition |
| Tractatus Canonicus de Sacra Ordinatione | Gasparri, Pietro; 1852-1934. | 1893 | Latin | Ordination (Canon law) |
| Tractatus Canonicus de Sanctissima Eucharistia | Gasparri, Pietro; 1852-1934. | 1897 | Latin | Mass (Canon law) |
| Tractatus de Apostasia | Wycliffe, John; d. 1384. | 1889 | Latin | Transubstantiation |
| Tractatus de Beatissima Virgine Maria Matre Dei | Lèpicier, Alexius Maria. | 1901 | Latin | Mary |
| Tractatus de Blasphemia | Wycliffe, John; d. 1384. | 1893 | Latin | Catholic Church |
| Tractatus de Deo Uno Et Trino | Jungmann, Bernardus. | 1882 | Latin | God |
| Tractatus de Divina Traditione Et Scriptura | Franzelin, Johannes Baptist; 1816-1886. | 1896 | Latin | Tradition (Theology) |
| Tractatus de Gratia Divina | Schiffini, Sancto; 1841-1906. | 1901 | Latin | Grace (Theology) |
| Tractatus de Matrimonio Christiano | Palmieri, Domenico; 1829-1909. | 1897 | Latin | Marriage |
| Tractatus de Novissimis | Jungmann, Bernardus. | 1885 | Latin | Eschatology |
| Tractatus de Poenitentia | Palmieri, Domenico; 1829-1909. | 1879 | Latin | Penance |
| Tractatus de Simonia | Wycliffe, John; d. 1384. | 1898 | Latin | Simony |
| Tractatus de Verbo Incarnato | Jungmann, Bernardus. | 1884 | Latin | Hypostatic union |
| Tractatus de Veritate Conceptionis Beatissimae Virginis: Pro Facienda Relatione Coram Patribus ConcilII Basileae, Anno Domini MCCCXXXVI, Mense Julio | Torquemada, Juan de; 1388-1468. | 1869 | Latin | Immaculate Conception |
| Tractatus de Virtutibus Infusis | Schiffini, Sancto; 1841-1906. | 1904 | Latin | Virtue, Infused |
| Tracts Theological and Ecclesiastical | Newman, John Henry; 1801-1890. | 1881 | English | Catholic Church |
| Tradition of the Syriac Church of Antioch: Concerning the Primacy and the Prerogatives of St. Peter and of HisSuccessors, the Roman Pontiffs, The | 1871 | English | Popes | |
| Training of a Priest: An Essay on Clerical Education: With a Reply to the Critics, The | Smith, John Talbot; 1855-1923. | 1908 | English | Catholic theological seminaries |
| Très-Humble Remontrance À Mgr. L'archeveìque de Paris: A Propos de Son Mandement Pour Le Careìme de Cette Annèe 1855. | 1855 | French | Immaculate Conception | |
| Trial and Self-Conviction of Pope Leo XIII. | Gràbner, A. L. (Augustus Lawrence); 1849-1904. | 1903 | English | Leo |
| Trials of a Mind in Its Progress to Catholicism: A Letter to His Old Friends, The | Ives, L. Silliman; (Levi Silliman); 1797-1867. | 1854 | English | Catholic converts |
| Tributes of Protestant Writers to the Truth and Beauty of Catholicity | 1885 | English | Catholic Church | |
| Triomphe Du St. Siège Et de L'èglise; Ou, Les Novateurs Moderns Combattus Avec Leurs Propres Armes | Gregory; XVI; Pope; 1765-1846. | 1833 | French | Popes |
| Triumph of the Catholic Church in the Early Ages | Manahan, Ambrose; 1814?-1867. | 1866 | English | Church history |
| Triunfo de La Verdad: En Justa Defensa Del Misterio Encumbrado de La Concepcion Sin Mancha de Marìa: Contra Un Dictamen Que Pretende Negar a La Madre de Dios Este Privilegio Escelso Y Su Definibilidad | Godinez Garcìa, Luis. | 1853 | Spanish | Immaculate Conception |
| True and the False Infallibility of the Popes: A Controversial Reply to Dr. Schulte, The | Fessler, Joseph; 1813-1872. | 1875 | English | Popes |
| True Faith of Our Forefathers, The | Augustinis, Aemilius M. de. | 1880 | English | Stearns, Edward Josiah |
| True Glory of Woman: As Portrayed in the Beautiful Life of the Virgin Mary, Mother of Our Lord and Saviour, Jesus Christ, The | Harbaugh, H. (Henry); 1817-1867. | 1858 | English | Mary |
| True Story of the Catholic Hierarchy Deposed by Queen Elizabeth: With Fuller Memoirs of Its Last Two Survivors, The | Bridgett, T. E. | 1889 | English | Persecution |
| True Story of the Vatican Council, The | Manning, Henry Edward; 1808-1892. | 1877 | English | Popes |
| Truth of Papal Claims: A Reply to the Validity of Papal Claims by F. Nutcombe Oxenham, The | Merry del Val, Raphael; 1865-1930. | 1902 | English | Papacy |
| Two Babylons, or, The Papal Worship Proved to Be the Worship of Nimrod and His Wife: With Sixty-One Woodcut Illustrations From Nineveh, Babylon, Egypt, PompeII, &c., The | Hislop, Alexander. | 1862 | English | Catholic Church |
| Two Kenricks: Most Rev. Francis Patrick, Archbishop of Baltimore, Most Rev. Peter Richard, Archbishop of St. Louis, The | O'Shea, John J. (John Joseph); 1842-1920. | 1903 | English | Kenrick, Francis Patrick |
| Two Sides of the School Question, The | 1890 | English | Religion in the public schools | |
| Tyburn Conferences: Oxford, Douay, Tyburn | Camm, Bede; 1864-1942. | 1906 | English | Christian martyrs |
| Ueber Das Nächste Allgemeine Concil | Dupanloup, Fèlix; 1802-1878. | 1869 | German | Councils and synods, Ecumenical |
| Ueber Das Verhältniss Des Textes Der Drei Syrischen Briefe Des Ignatios Zu Den Übrigen Recensionen Der Ignatianischen Literatur | Lipsius, Richard Adelbert; 1830-1892. | 1859 | German | Ignatius |
| Ueber Die Allgemeinen Kirchenversammlungen: Anlässlich Des Von Sr. H. Dem Papste Pius IX. Auf Den 8. Dezember 1869 Einberufenen Ökumenischen Concils | Plantier, C. H. A. (Claude Henri Augustin); 1813-1875. | 1869 | German | Councils and synods |
| Ueber Die Aufgabe Des Oekumenischen Concils Zu Rom | Waagen, Carl. | 1870 | German | Catholic Church |
| Ueber Die Composition Des Liber Pontificalis Bis Zu Papst Constantin (715) | Rosenfeld, Felix Georg. | 1896 | German | Popes |
| Ueber Wahrheit Und Gerechtigkeit: Antwort Auf Die Im Oktober 1875 Von Den Bischöfen Bayerns Bei Sr. Majestät Dem König Eingereichte Vorstellung | Friedrich, J. (Johann); 1836-1917. | 1876 | German | Old Catholic Church |
| Un Antico Catalogo Greco De' Romani Pontefici Inedito | Mercati, Giovanni; 1866-1957. | 1891 | Italian | Papacy |
| Un Catholicisme Amèricain | Delattre, A. J. (Alphonse J.); 1841-1928. | 1898 | French | Hecker, Isaac Thomas |
| Un Preìtre Mariè: Charles Perraud, Chanoine Honoraire D'autun, 1831-1892 | Houtin, Albert; 1867-1926. | 1908 | French | Catholics |
| Under the Ban: A Correspondence Between St. George Mivart and Herbert Cardinal Vaughan: Accompanied by Two Articles by Dr. Mivart on "Some Recent Catholic Apologists" and "the Continuity of Catholicism". | Mivart, St. George Jackson; 1827-1900. | 1900 | English | Mivart, St. George Jackson |
| Ungedruckte Berichte Und Tagebùcher Zur Geschichte Des Concils Von Trient | 1876 | Italian | Council of Trent | |
| Unity of the Episcopate: Considered in Reply to the Work of the Rev. T.W. Allies, M.A. Entitled `the Church ofEngland Cleared From the Charge of Schism, Upon Testimonies and Councils of Fathers of the First Six Centuries, The | Thompson, Edward Healy; b. 1813. | 1848 | English | Papacy |
| Unpublished Letters of Charles Carroll of Carrollton and of His Father, Charles Carroll of Doughoregan | Carroll, Charles; 1737-1832. | 1902 | English | Catholics |
| Unser Heiliger Vater Papst Leo XIII: In Seinem Leben Und Wirken | Kühne, Benno; 1833-1916. | 1883 | German | Popes |
| Unter Welchen Bedingungen Kann Der Altkatholizismus Seine Ihm Von Gott Gegebens Aufgabe, Die Römische Weltherrschaft Endgültig Zu Stürzen, Erfüllen: Eine Gewissensfrage an Die Altkatholiken Zunächst Badens | Michelis, Friedrich; 1815-1886. | 1878 | German | Old Catholicism |
| Unterscheidungslehren Der Kathol. Kirche Und Der Protestanten: Zum Gebrauche Bei Dem Erstkommunikanten-Unterricht Und Für Erwachsene | Schmitz, Fortunat. | 1903 | German | Protestantism |
| Untersuchung Über Alter, Ursprung, Zweck Der Dekretalen Des Falschen Isidorus | Gfrörer, A. Fr. (August Friedrich); 1803-1861. | 1848 | German | Letters, Papal |
| Untersuchungen Über Die Äussere Entwicklung Der Afrikanischen Kirche: Mit Besonderer Verwertung Der Archäologischen Funde | Schwarze, Alexis; 1853-1922? | 1892 | German | Christian antiquities |
| Urban VIII: Being the Lothian Prize Essay for 1903 | Weech, William Nassau. | 1905 | English | Popes |
| Ursprung, Umfang, Hemmnisse, Und Aussichten Der Altkatholischen Bewegung: Vortrag Im Berner Grossrathssaale Am 7. Januar 1873 Gehalten Und Mit Literarischen Anmerkungen Vermehrt | Nippold, Friedrich. | 1873 | German | Old Catholicism |
| Use of Sarum: The Original Texts, The | 1898 | Latin | Catholic Church | |
| Valeria, the Martyr of the Catacombs: A Tale of Early Christian Life in Rome | Withrow, W. H. (William Henry); 1839-1908. | 1882 | English | Christian life |
| Valerian Persecution: A Study of the Relations Between Church and State in the Third Century A.D., The | Healy, Patrick J. (Patrick Joseph); 1872-1937. | 1905 | English | Persecution |
| Valeur Des Dècisions Doctrinales Et Disciplinaires Du Saint-Siège: Syllabus, Index, Saint-Office, Galilèe | Choupin, Lucien; 1859-1932. | 1907 | French | Popes |
| Validity of English Ordinations From an Orthodox Catholic Point of View, The | Androutsos, Chrēstos; 1869-1937. | 1909 | English | Ordination |
| Validity of Papal Claims: Five Lectures, The | Oxenham, Frank Nutcombe; b. 1840. | 1897 | English | Papacy |
| Vatican Council and Its Definitions: A Pastoral Letter to the Clergy, The | Manning, Henry Edward; 1808-1892. | 1871 | English | Popes |
| Vatican Council: Eight Months at Rome During the Vatican Council: Impressions of a Contemporary, The | Leto, Pomponio; b. 1829. | 1876 | English | Catholic Church |
| Vatican Decrees in Their Bearing on Civil Allegiance, The | Manning, Henry Edward; 1808-1892. | 1875 | English | Church and state |
| Vatican Decrees in Their Bearing on Civil Allegiance: A Political Expostulation | Gladstone, W. E. (William Ewart); 1809-1898. | 1874 | English | Popes |
| Vatican Decrees in Their Bearing on Civil Allegiance: A Political Expostulation, The | Gladstone, W. E. (William Ewart); 1809-1898. | 1875 | English | Popes |
| Veneration of the Blessed Virgin: Her Feasts, Prayers, Religious Orders, and Sodalities | Rohner, B. | 1898 | English | Mary |
| Versuch Einer Geschichte Des Marien-Und Annen-Cultus in Der Katholischen Kirche | Frantz, Cl. (Clamor) | 1854 | German | Mary |
| Vie de M. Dupont: Mort À Tours En Odeur de Saintetè Le 18 Mars 1876: D'après Ses Ècrits Et Autres Documents Authentiques | Janvier, Pierre Desirè; b. 1817. | 1879 | French | Catholics |
| Vie Et Vertus de L'humble Servante de Dieu: La Vènèrable Anna-Maria Tàgi | Luquet, J.-F.-O. (Jean Felix Onèsime) | 1863 | French | Catholics |
| Vie Intime de Pie X | Cigala, C. Albin de. | 1904 | French | Popes |
| Vindiciae Ignatianae, or, The Genuine Writings of St. Ignatius: As Exhibited in the Antient sic Syriac Version, Vindicated From the Charge of Heresy | Cureton, William; 1808-1864. | 1846 | English | Ignatius |
| Virgin Mother: Retreat Addresses on the Life of the Blessed Virgin Mary as Told in the Gospels: With an Appended Essay on the Virgin Birth of Our Lord Jesus Christ, The | Hall, A. C. A. (Arthur Crawshay Alliston); 1847-1930. | 1894 | English | Virgin birth |
| Vocations: Conditions of Admission, Etc., Into the Monasteries, Congregations, Societies, Religious Institutes, Etc: According to Authentical Information and the Latest Regulations | Hohn, H. (Hermann) | 1910 | English | Monasticism and religious orders |
| Voice of the Church: Golden Words From Eminent Prelates Demonstrating the Truth, Holiness, and Beauty of the Catholic Faith, The | 1897 | English | Catholic Church | |
| Von Der Fallstricken Etlicher Newer Sacraments. | Wigand, Johann; 1523-1587. | 1572 | German | |
| Von Palästrina Nach Anagni: Eine Jubiläumsschrift | Buchmann, J. (Jacob); b. 1865 or 6. | 1876 | German | Papacy |
| Vor Der Bartholomäusnacht | Baumgarten, Hermann; 1825-1893. | 1882 | German | Saint Bartholomew's Day, Massacre of, 1572 |
| Vorlesungen Über Den Syllabus Errorum Der Päpstlichen Encyclica Vom 8. Dezember 1864 | Tosi, Josef. | 1865 | German | Catholic Church |
| Wallfahrten Zu Unserer Lieben Frau in Legende Und Geschichte | Beissel, Stephan; 1841-1915. | 1913 | German | Christian pilgrims and pilgrimages |
| War of Antichrist With the Church and Christian Civilization: Lectures, The | Dillon, George F. | 1884 | English | Freemasonry |
| Was Ist Durch Die Vaticanischen Decrete Geändert Worden? Erster Vortrag | Buchmann, J. (Jacob); b. 1805 or 6. | 1875 | German | Catholic Church |
| Was Savonarola Really Excommunicated?: An Inquiry | O'Neil, J. L. (James Louis) | 1899 | English | Excommunication |
| Wayside: A Priest's Gleanings, The | McNabb, Vincent; 1868-1943. | 1915 | English | Catholic Church |
| Wegweiser in Die Marianishe Literatur: Zunächst Für Maivorträge Und Vereins-ansprachen: Eine Sammlung Vorzugsweise Deutscher Werke Der Vier Letzten Jahrzehnte, Nebst Winken Zu Deren Benützung Und Ergänzung | Kolb, Georg; b. 1843. | 1888 | German | Mary |
| Welche Wege Führen Nach Rom?: Geschichtliche Beleuchtung Der Römischen Illusionen Über Die Erfolge Der Propaganda | Nippold, Friedrich. | 1869 | German | Catholic converts |
| Wer Ist Der Papst, Und Wer Ist Pius IX. Unter Den Päpsten?: Eine Festrede | Weninger, F. X. (Francis Xavier); 1805-1888. | 1871 | German | Papacy |
| What Are the Catholic Claims: The Catholic Answer to Mr. Gore's Book (the Roman Catholic Claims) | Richardson, Austin. | 1889 | English | Gore, Charles |
| What Christ Revealed | Jouin, Louis; 1818-1899. | 1897 | English | Catholic Church |
| What Is Catholicism? | Scherer, Edmond Henri Adolphe; 1815-1889. | 1900 | English | Catholic Church |
| What Is Modern Romanism?: A Consideration of Such Portions of Holy Scripture, as Have Alleged Bearings on the Claims of Modern Rome | Seymour, George Franklin; 1829-1906. | 1888 | English | Popes |
| What Is the Meaning of the Late Definition on the Infallibility of the Pope?: An Enquiry | Maskell, William; 1814?-1890. | 1871 | English | Popes |
| What Rome Teaches | Cusack, Mary Francis; 1829-1899. | 1891 | English | Catholic Church |
| What We Want: An Open Letter to Pius X | 1907 | English | Modernism | |
| When Does the Church Speak Infallibly?, or, The Nature and Scope of the Church's Teaching Office | Knox, Thomas Francis. | 1870 | English | Catholic Church |
| Which Is the True Church? | C. F. B. A. (Charles F. B. Allnatt) | 1879 | English | Protestantism |
| Who Are the Jesuits? | Coppens, Charles; 1835-1920. | 1911 | English | Jesuits |
| Why Do Protestants Not Invoke the Virgin? | Godts, G. M. | 1901 | English | Protestantism |
| Wibert Von Ravenna (Papst Clemens III): Ein Beitrag Zur Papstgeschichte | Köhncke, Otto. | 1888 | German | Papacy |
| Wilhelm Cardinal Allen (1532-1594) Und Die Englischen Seminare Auf Dem Festlande | Bellesheim, Alphons; 1839-1912. | 1885 | German | Catholic theological seminaries |
| Wilhelm Von St. Thierry: Ein Repräsentant Der Mittelalterlichen Frömmigkeit | Kutter, Hermann; 1863-1931. | 1898 | German | William |
| William Cardinal Allen: Founder of the Seminaries | Camm, Bede; 1864-1942. | 1908 | English | Catholics |
| William George Ward and the Catholic Revival | Ward, Wilfrid Philip; 1856-1916. | 1893 | English | Oxford movement |
| William George Ward and the Oxford Movement | Ward, Wilfrid Philip; 1856-1916. | 1889 | English | Oxford movement |
| Wisdom of the Desert, The | 1904 | English | Christian life | |
| Wissenschaftliche Richtungen Auf Dem Gebiete Des Katholicismus in Neuester Und in Gegenwärtiger Zeit | Schmid, A. | 1862 | German | Catholic Church and philosophy |
| With the Russian Pilgrims to Jerusalem | Graham, Stephen; 1884- | 1913 | English | Christian pilgrims and pilgrimages |
| Within and Without the Church | Laxenaire, J. 1865-1944. | 1904 | English | Salvation outside the Catholic Church |
| Witness of the Ante-nicene Fathers Against the Claims of the Roman Patriarchate, The | Chambers, J. C. (John Charles); 1817-1874. | 1897 | English | Papacy |
| Woman Blessed by All Generations, or, Mary: The Object of Veneration, Confidence, and Imitation to All Christians, The | Melia, Raphael; 1805-1876. | 1868 | English | Mary |
| Woman in Purple and Scarlet, or, The Downfall of Catholicism: The Revelation of the Man of Sin and His Destruction at the Coming of Christ, Together With the Wonderful Changes in the Earth During the Millennium, The | White, Ambie. | 1870 | English | Catholic Church |
| Women of Catholicity: Memoirs of Margaret O'Carroll, Isabella of Castile, Margaret Roper, Marie de L'incarnation, Marguerite Bourgeoys, Ethan Allen's Daughter | Sadlier, Anna T. (Anna Theresa); b. 1854. | 1885 | English | Catholics |
| Works of the Right Reverend John England, First Bishop of Charleston, The | England, John; 1786-1842. | 1908 | English | Catholic Church |
| World's Columbian Catholic Congresses: With an Epitome of Church Progress...Embracing Official Proceedings ofAll the Chicago Catholic Congresses of 1893...to Which Is Added an Epitome of Catholic Church Progress in the United…, The | 1893 | English | Catholic Church | |
| Worship of the Blessed Virgin Mary in the Church of Rome Proved to Be Contrary to Holy Scripture and to the Faith and Practice of the Church of Christ Through the First Five Centuries, The | Tyler, J. Endell. | 1851 | English | Mary |
| Worte Zur Verständigung Im Streite Über Die Päpstliche Unfehlbarkeit | Mayr, Aloys. | 1871 | German | Popes |
| Yorke-Wendte Controversy: Letters on the Papal Primacy and the Relations of Church and State, The | Wendte, Charles William; 1844-1931. | 1896 | English | Popes |
| Zum Lobe Der Unbefleckten Empfängniss Der Allerseligsten Jungfrau | Preuss, Ed. (Eduard); 1834-1904. | 1879 | German | Immaculate Conception |
| Zur Ältesten Geschichte Des Primates in Der Kirche | Friedrich, J. (Johann); 1836-1917. | 1879 | German | Popes |
| Zur Entstehungsgeschichte Des Kanons in Der Römischen Messe | Drews, Paul; 1858-1912. | 1902 | German | Eucharistic prayers |
| Zur Gegenreformation in Schlesien: Troppau, Jägerndorf, Leobschütz: Neue Archivalische Aufschlüsse | Loesche, Georg; 1855-1932. | 1915 | German | Counter-Reformation |
| Zur Geschichte Der Marienverehrung | Benrath, Karl. | 1886 | German | Mary |
| Zur Geschichte Des Concils Von Trient (1559-1563): Actenstùcke Aus Òsterreichischen Archiven | 1872 | Latin | Catholic Church | |
| Zur Kirchengeschichte Des XIX. Jahrhunderts: Papstum Und Kirchenstaat | Nürnberger, Aug. Jos. | 1897 | German | Papacy |
| Zur Seligsprechungs-Feier Des Seligen Peter Canisius | Weninger, F. X. (Francis Xavier); 1805-1888. | 1865 | German | Canisius, Petrus |
| Zur Unfehlbarkeit Des Päpstlichen Lehramtes: Vortrag Des Professor Dr. Michelis Aus Braunsberg Gehalten Im Schrannensaale Zu Würzburg Am 5. November 1872: Nebst Einem Anhang, Hergenröther Und Die Logik. | Michelis, Friedrich; 1815-1886. | 1873 | German | Popes |
| Zur Vorgeschichte Der Bartholomäusnacht: Historisch-Kritische Studie | Wuttke, Heinrich; 1818-1876. | 1879 | German | Saint Bartholomew's Day, Massacre of, France, 1572 |
| Zur Würdigung Der Unfehlbarkeit Des Papstes Und Der Kirche | Frohschammer, J. (Jakob); 1821-1893. | 1869 | German | Popes |
| Züruck Zur Heiligen Kirche: Erlebnisse Und Erkenntnisse Eines Convertiten | Ruville, Albert von; 1855-1934. | 1910 | German | Catholic converts |
| Zweite Frage, Kann Man Noch Christ Sein, Ohne Katholik Zu Sein? | Martinet; abbè; (Antoine); 1802-1871. | 1859 | German | Catholic Church |