Refutation of the Muslims who accuse the Christians of Believing in Three GodsengAbu al-Khayr ibn al-Tayyib 1204-1245

Roman HistoryengAmmianus Marcellinus 330-399

The Religious Discussion at the Court of the SassanidsengAnonymous 9999

Recognitions of Clement: Sinai Epitome100-299engAnonymous 100-299

The Recognitions of Clement100-299engAnonymous 100-299

The Report of Pilate the Procurator Concerning Our Lord Jesus Christ: First Greek FormengAnonymous 9999

The Report of Pilate the Procurator Concerning Our Lord Jesus Christ: Second Greek FormengAnonymous 9999

Revelation of MosesengAnonymous 100-199

Revelation of EsdrasengAnonymous 100-199

Revelation of PaulengAnonymous 100-199

Revelation of JohnengAnonymous 100-199

Refutation of the Hypocrisy of Meletius and Eusebiuseng ⸱ grcAthanasius of Alexandria 295-373

Reply to Faustus the ManichæanengAugustine of Hippo 354-430

Retractationum Libri Duo354-430latAugustine of Hippo 354-430

Regula ad Servos Dei354-430latAugustine of Hippo 354-430

Regulae Clericis Traditae Fragmentum354-430latAugustine of Hippo 354-430

Regula Secunda354-430latAugustine of Hippo 354-430

De Rectitudine Catholicae Conversationis Tractatus [Incertus]354-430latAugustine of Hippo 354-430

De Rusticiano Subdiacono A Donatistis Rebaptizato [Incertus]354-430latAugustine of Hippo 354-430

Religiosas inter familias, Litterae apostolicae, Venerabili Dei Famulae Lodovicae De Marillac, vidue Le Gras, confundatrici Congregationis puellarum a caritate, beatorum honores decernuntur, d. 9 m. Maii a. 1920, Benedictus PP. XV1920-05-09latBenedict XV 1914-22

De Revelatione Capitis Beati Joannis Baptistae Tractatus [Incertus]200-258latCyprian of Carthage 200-258

Responses to Deacon Tiberius and His Companionseng ⸱ grcCyril of Alexandria 376-444

RefutationsengEphrem the Syrian 306-373

RhesusengEuripides -480 TO -406

Reasons for Monastic Matterseng ⸱ grcEvagrius the Monk (Ponticus) 345-399

Regula Fratrum Sororumque De Poenitentia, Qui Iidem Tertiarii DicunturlatFrancis of Assisi 1181-1226

Regula, Quam S. Clarae Sanctimonialibus B. Franciscus ConscripsitlatFrancis of Assisi 1181-1226

Rubrica [Liturgica]latFrancis of Assisi 1181-1226

Robert BrowningengG. K. Chesterton 1874-1936

Robert Louis StevensonengG. K. Chesterton 1874-1936

The Return of Don QuixoteengG. K. Chesterton 1874-1936

The Rolling English RoadengG. K. Chesterton 1874-1936

The Ruin of BritainengGildas the Wise 500-570

Refutation of Eunomius' Confessioneng ⸱ grcGregory of Nyssa 335-395

The Refutation of All Heresieseng ⸱ grcHippolytus of Rome 170–235

Regula Monachorum Per Lupum De Olmeto Collecta347-420latJerome 347-420

Regula Monacharum. Indigna prorsus, quae Hieronymo affigeretur, doctis probisque hominibus visa est. Sane neque est, in quo consarcinatoris diligentiam laudes347-420latJerome 347-420

Reportata Parisiensia Liber PrimuslatJohn Duns Scotus 1266-1308

Reportata Parisiensia Liber QuartuslatJohn Duns Scotus 1266-1308

Reportata Parisiensia Liber SecunduslatJohn Duns Scotus 1266-1308

Reportata Parisiensia Liber TertiuslatJohn Duns Scotus 1266-1308

The RamblerengJohn Henry Newman 1801-1890

Rise and Progress of UniversitiesengJohn Henry Newman 1801-1890

Rupefucaldine sacred parallelseng ⸱ grcJohn of Damascus 675-749

Rufiniani Libelli Interpretatio1844-1855latJulian of Eclanum 386-455

Revelations of Divine LoveengJulian of Norwich 1342-1416

Refutation of Certain Aristotelian Dogmaseng ⸱ grcJustin Martyr 100-165

Romanos Pontifices (13 Maii 1881)1881-05-13latLeo XIII 1878-1903

Reputantibus saepe (20 Augusti 1901)1901-08-20latLeo XIII 1878-1903

Rerum NovarumengLeo XIII 1878-1903

Rei catholicae (20 Octobris 1900)1900-10-20latLeo XIII 1878-1903

Règles des Filles de la Sagesse (ou de la Providence)fraLouis de Montfort 1673-1716

Règles des prêtres missionnaires de la Compagnie de MariefraLouis de Montfort 1673-1716

Raphaelis Bagatae Et Baptistae Peretti Praefatio In Eamdem Editionem Veronensem An. 15861844-1855latMigne Editors 1836–1876

Ratio Orthographiae In Orosii codice Longobardico et antiquissimo bibliothecae Florentinae mediceae S. Laurentii, Quam sequuntur alii duo codd. ejusdem Biblioth. et praesertim XXXV1844-1855latMigne Editors 1836–1876

Regi Christianissimo Ludovico Magno, Victori, Triumphatori, Pacifico1844-1855latMigne Editors 1836–1876

Roman Historyeng ⸱ grcNicephorus Gregoras 1295-1360

Refutation and Overthrow of the Synodal Definition of the Yeareng ⸱ grcNicephorus of Constantinople 750-815

RespicientesengPius IX 1846-78

Regnans in ExcelsisengPius V 1566-72

Religiosas familias (die 12 Septembris anno 1912)1912-09-16latPius X 1903-14

In Romanae Curiae (8 Decembris 1910)1910-12-08latPius X 1903-14

Romanum decet (die 6 Iulii anno 1910)1910-07-06latPius X 1903-14

Refert ad Nos (die 6 Aprilis anno 1910)1910-04-06latPius X 1903-14

Religiosorum Ordinum (19 Martii 1906)1906-03-19latPius X 1903-14

Relicturus Ecclesiam (16 Decembris 1907)1907-12-16latPius X 1903-14

Romanorum Pontificum, Motu Proprio, De Pio opere a propagatioone fidei amplificando, d. 3 m. Maii a. 1922, Pius PP. XI1922-05-03latPius XI 1922-39

Rerum EcclesiaeengPius XI 1922-39

Rerum Omnium PerturbationemengPius XI 1922-39

Romani Pontificis, Motu Proprio, Gratiae et privilegia clericis conclavistis concessa, d. 12 m. Martii a. 1922, Pius PP. XI1922-03-12latPius XI 1922-39

Rite ExpiatisengPius XI 1922-39

Rerum OrientaliumengPius XI 1922-39

Radio Message to the faithful of the United States and Canada for the Third Centenary of the North American martyrs (27 November 1946)1946-11-24engPius XII 1939-58

Redemptoris Nostri CruciatusengPius XII 1939-58

Radio messageon the 50th anniversary of the Catholic University of America in Washington, D.C. (November 13, 1939)1939-11-13engPius XII 1939-58

Radio Message at the closing of the National Catechetical Congress of the United States in Boston (October 26, 1946)1946-10-26engPius XII 1939-58

Radio message to celebrate in Ernakulam the centenaries of the holy Apostle Thomas and St. Francis Xavier (31 December 1952)1952-12-31engPius XII 1939-58

Radiomessage of His Holiness Pius XII (16 November 1947)1947-11-16engPius XII 1939-58

Radio message to the faithful of New Zealand  (February 1, 1940)1940-02-01engPius XII 1939-58

Radio Message to the people of South Africa and to the Italian prisoners (August 3, 1944)1944-08-03engPius XII 1939-58

Radio message Non è forse to television viewers connected for the first time with England, Holland, Belgium, Denmark, France, Germany and Italy (June 6, 1954)1954-05-06engPius XII 1939-58

Radio message "Benignitas et humanitas" for Christmas (December 24, 1944)1944-12-24engPius XII 1939-58

The RepublicengPlato -428 TO -347

Refutation of Procluseng ⸱ grcProcopius of Gaza 465-528

Reality - a Synthesis of Thomistic ThoughtengRéginald Marie Garrigou-Lagrange 1877-1964

Rufinus's Epilogue to Pamphilus the Martyr's Apology for Origen; otherwise the Book Concerning the Adulteration of the Works of OrigenengRufinus of Aquileia 340–410

Rufinus' Apology in Defence of HimselfengRufinus of Aquileia 340–410

Rufinus' Preface to the Translation of Origen's Commentary on Psalms 36, 37, and 38engRufinus of Aquileia 340–410

Rufinus' Preface to the Translation of Origen's Commentary on the Epistle to the RomansengRufinus of Aquileia 340–410

Rufini Aquileiensis Presbyteri Historiae Ecclesiasticae Libri Duo345-410latRufinus of Aquileia 340–410

Rufini Aquileiensis Presbyteri Apologiae In Sanctum Hieronymum Libri Duo345-410latRufinus of Aquileia 340–410

De Resurrectione Carnis160-220latTertullian 155-240

Religious Historyeng ⸱ grcTheodoret of Cyrus 393-466

De Rationibus FideilatThomas Aquinas 1225-1274

De Regimine JudaeorumlatThomas Aquinas 1225-1274

De Regimine PrincipumlatThomas Aquinas 1225-1274

Reportationes Ineditae LeoninaelatThomas Aquinas 1225-1274

Resp. Ad Lect. BisuntinumlatThomas Aquinas 1225-1274

Resp. Ad Lect. Venetum De Art. 36latThomas Aquinas 1225-1274

Resp. Ad Lect. Vercell. De Art. 108latThomas Aquinas 1225-1274

Resp. Ad Lect. Vercell. De Art. 42latThomas Aquinas 1225-1274

Responsio Ad BernardumlatThomas Aquinas 1225-1274

Remissiones Geographicae Quarumdam Vocum Modernarum Urbium Et Locorum500-600latVarious Authors 500-600