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- Obadiah Sforno's works1576Duke Humfrey's Library, Bodleiancatalogue record
- Obsidionis Rhodiae urbis descriptio1482Duke Humfrey's Library, Bodleiancatalogue record
- Occasion ... for DisasterGarrett, Randall; Janifer, Laurence M.Project Gutenbergfree to read
- An Occurrence at Owl Creek BridgeBierce, AmbroseProject Gutenbergfree to read
- The OdysseyHomer~700Global reading listread here
- The OdysseyHomerc. 700 BCEProject Gutenbergread here
- Oedipus King of Thebes: Translated into English Rhyming Verse with Explanatory NotesSophoclesProject Gutenbergfree to read
- Oedipus Plays and AntigoneSophoclesc. 441 BCEProject Gutenbergread here
- Off on a Comet! a Journey through Planetary SpaceVerne, JulesProject Gutenbergfree to read
- Offices, prayers for a lady's private use1500Duke Humfrey's Library, Bodleiancatalogue record
- Official Gazette of the Republic of Tunisia1860Labrouste Reading Room, BnFcatalogue record
- Ohev Mishpaṭ: Commentary on the Book of Job1440Duke Humfrey's Library, Bodleiancatalogue record
- Old High German TatianAbbey Library of St Gallcatalogue record
- The Old Lady fliesWhitfield, RaoulProject Gutenbergfree to read
- An Old Man's LoveTrollope, AnthonyProject Gutenbergfree to read
- Old Testament (Joshua-Kings) (Catalan translation)1401Duke Humfrey's Library, Bodleiancatalogue record
- Oliver TwistDickens, CharlesProject Gutenbergfree to read
- Oliver Twist, Vol. 2 (of 3)Dickens, CharlesProject Gutenbergfree to read
- Olympic Victor Monuments and Greek Athletic ArtHyde, Walter WoodburnProject Gutenbergfree to read
- On LibertyMill, John StuartProject Gutenbergfree to read
- On popular cooking in the family : a contribution from the thirty years of experience of the soup kitchen in DarmstadtLibrary of Congress Main Reading Roomcatalogue record
- On the Cross: A Romance of the Passion Play at OberammergauHillern, Wilhelmine vonProject Gutenbergfree to read
- On the Duties of the ClergyAmbrose, Saint, Bishop of MilanProject Gutenbergfree to read
- On the Duty of Civil DisobedienceThoreau, Henry DavidProject Gutenbergfree to read
- On the Nature of ThingsLucretius Carus, TitusProject Gutenbergfree to read
- On the Origin of SpeciesCharles Darwin1859Standard Ebooksread here
- On the Origin of Species (first edition)Charles Darwin1859George Peabody Libraryread here
- On the Origin of Species by Means of Natural SelectionDarwin, CharlesProject Gutenbergfree to read
- On the Trail of the Space PiratesRockwell, CareyProject Gutenbergfree to read
- On WarClausewitz, Carl vonProject Gutenbergfree to read
- One Hundred Plays of the Yuan DynastyLabrouste Reading Room, BnFcatalogue record
- One jump aheadHumphreys, RayProject Gutenbergfree to read
- One of the Six Hundred: A NovelGrant, JamesProject Gutenbergfree to read
- One Woman: Being the Second Part of a Romance of SussexOllivant, AlfredProject Gutenbergfree to read
- Only a clodBraddon, M. E. (Mary Elizabeth)Project Gutenbergfree to read
- Only a girl's loveGarvice, CharlesProject Gutenbergfree to read
- Only seven were hangedMartin, StuartProject Gutenbergfree to read
- OperaLactantius1465Duke Humfrey's Library, Bodleiancatalogue record
- Opera (ed. Thaddaeus Ugoletus)1500Duke Humfrey's Library, Bodleiancatalogue record
- Opera medicinalia (Il libro della consolatione della medicine, semplici, solutive)1487Duke Humfrey's Library, Bodleiancatalogue record
- Opera noua contemplatiua [per] ogni fidel christiano laquale tratta de le figure del testamento vecchio : le quale figure sonno verificate nel testamento nuouo1525Duke Humfrey's Library, Bodleiancatalogue record
- Opera, et al.1475Duke Humfrey's Library, Bodleiancatalogue record
- Opera, et al. (ed. Benedictus Brognolus)1476Duke Humfrey's Library, Bodleiancatalogue record
- Opera: Bellum Catilinae; Bellum Iugurthinum, et al. (ed. Philippus Beroaldus)1483Duke Humfrey's Library, Bodleiancatalogue record
- Opera: Bucolica and Georgica (comm. Maurus Servius Honoratus, Christophorus Landinus, and Antonius Mancinellus); Aeneis, with argumenta (comm. Maurus Servius Honoratus, Tiberius Claudius Donatus, and Christophorus Landinus), et al.1499Duke Humfrey's Library, Bodleiancatalogue record
- Opera: Steiner tradition 1 'Puteolanus'1480Duke Humfrey's Library, Bodleiancatalogue record
- Opera: Steiner tradition 5 'Accursius'1486Duke Humfrey's Library, Bodleiancatalogue record
- OpticksIsaac Newton1704Project Gutenbergread here
- Opusculum de ratione spere1150Duke Humfrey's Library, Bodleiancatalogue record
- OraculaLeo VI the Wise1577Duke Humfrey's Library, Bodleiancatalogue record
- Oratio ad suu[m] p[ro]priu[m] angelu[m] (‘The Prayer Book of Emperor Maximilian I’ or ‘The Maximilian Prayer Book’)1513Duke Humfrey's Library, Bodleiancatalogue record
- Orationes1495Duke Humfrey's Library, Bodleiancatalogue record
- Ordenações de D. Manuel1521Real Gabinete Português de Leituracatalogue record
- Order of the MagiBiblioteca Nacional de Españacatalogue record
- Ordinal of the Cistercian nunnery of St. Mary and St. Maurice, Medingen1300Duke Humfrey's Library, Bodleiancatalogue record
- Ordinancie Van der Munten1489Duke Humfrey's Library, Bodleiancatalogue record
- Ordinarius ad usum Bisuntinensem1487Duke Humfrey's Library, Bodleiancatalogue record
- The Origin of Species by Means of Natural Selection: Or, the Preservation of Favoured Races in the Struggle for Life, 6th EditionDarwin, CharlesProject Gutenbergfree to read
- Orlando furioso1576Duke Humfrey's Library, Bodleiancatalogue record
- Ormesby Psalter1400Duke Humfrey's Library, Bodleiancatalogue record
- OrmulumOrmDuke Humfrey's Library, Bodleiancatalogue record
- Orsini missalMaestro di BeffiSistine Hall, Vatican Librarycatalogue record
- Os Lusíadas (princeps edition)Luís de Camões1572Real Gabinete Português de Leituracatalogue record
- Ostereier für BuchhändlerEduard WenglerBavarian State Librarycatalogue record
- Osterreichische Nationalbibliothek 1010Prunksaal, Austrian National Librarycatalogue record
- Osterreichische Nationalbibliothek 13378Prunksaal, Austrian National Librarycatalogue record
- Osterreichische Nationalbibliothek 2511Prunksaal, Austrian National Librarycatalogue record
- Osterreichische Nationalbibliothek 303Prunksaal, Austrian National Librarycatalogue record
- Osterreichische Nationalbibliothek 4609Prunksaal, Austrian National Librarycatalogue record
- Österreichische Nationalbibliothek Theol. gr. 117901Prunksaal, Austrian National Librarycatalogue record
- Österreichische Nationalbibliothek Theol. gr. 1641101Prunksaal, Austrian National Librarycatalogue record
- Österreichische Nationalbibliothek Theol. gr. 2511501Prunksaal, Austrian National Librarycatalogue record
- Österreichische Nationalbibliothek Theol. gr. 301901Prunksaal, Austrian National Librarycatalogue record
- Österreichische Nationalbibliothek Theol. gr. 3241401Prunksaal, Austrian National Librarycatalogue record
- Österreichische Nationalbibliothek Theol. gr. 791101Prunksaal, Austrian National Librarycatalogue record
- Österreichische Nationalbibliothek Theol. gr. 801101Prunksaal, Austrian National Librarycatalogue record
- Ottheinrich BibleMatthias Gerung2000Bavarian State Librarycatalogue record
- Ottobonianus latinus 18291400Sistine Hall, Vatican Librarycatalogue record
- Otuel a knight1800Duke Humfrey's Library, Bodleiancatalogue record
- Our Mutual FriendDickens, CharlesProject Gutenbergfree to read
- Our Time. German Review of the PresentBavarian State Librarycatalogue record
- Out of Time's AbyssBurroughs, Edgar RiceProject Gutenbergfree to read
- Oxford Facsimiles of the Herculaneum PapyriJohn Hayter (copies)1802-1806Villa of the Papyricatalogue record
- Oxford Psalter1140Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodeleian Library, MS. Huntington 171174Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library MS. Rawl. D. 8931400Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, Add. C 144Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, Auct. E. 1. 13 (Misc. 027)Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, Auct. E. 2. 6 (Misc. 034)Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, Auct. E. 3. 08 (Misc. 051.8)Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, Auct. E. 3. 09 (Misc. 051.9)Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, Auct. E. 3. 10 (Misc. 051.10)Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, Auct. E. 3. 11 (Misc. 051.11)Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, Auct. E. 3. 12 (Misc. 51.12)Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, Auct. E. 3. 13 (Misc. 051.13)Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, Auct. E. 3. 15 (Misc. 051.15)Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, Auct. E. 3. 16 (Misc. 051.16)Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, Auct. E. 4. 02 (Misc. 051.18)Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, Auct. E. 4. 04 (Misc. 051.20)Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, Auct. E. 4. 05 (Misc. 051.21)Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, Auct. E. 5. 12 (Misc. 077)Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, Auct. F.4.32Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, Auct. T. 3. 4 (Misc. 221)Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, Auct. T. 4. 18 (Misc. 256)Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, Auct. T. inf. 2. 01 (Misc. 312)Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, Auct. T.2.20Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, Barocci 102Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, Barocci 172Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, Barocci 186Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, Barocci 189Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, Barocci 199Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, Barocci 212Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, Barocci 2341290Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, Barocci 241Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, Barocci 55Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, Barocci 59Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, Barocci 96Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, Canon. gr. 100Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, Canon. gr. 99Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, Clarke 50Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, Cromwell 20Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, D'Orville 77Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, Hatton 42Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, Holkham gr. 22Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, Holkham gr. 27Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, Holkham gr. 30Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, Holkham gr. 42Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, Holkham gr. 43Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, Holkham gr. 44Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, Holkham gr. 48Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, Holkham misc. 19Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, Junius 25Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, lat.th.c.5 (SC. 32.564)Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, Laud gr. 21Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, Laud gr. 64aDuke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, Laud Misc. 421Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, MS Michael 2761700Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, MS Rawlinson B. 488Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, MS Rawlinson B. 503Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, MS. Barocci 235876Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, MS. Fr. b. 11300Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, MS. Laud Lat. 31290Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, MS. Rawl. C. 4001400Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, MS. Rawl. F. 2251500Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, MS. Rawl. G. 1111100Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, Roe 24Duke Humfrey's Library, Bodleiancatalogue record
- Oxford, Bodleian Library, Roe 28Duke Humfrey's Library, Bodleiancatalogue record
- Oxyrhynchus Papyrus 1224Duke Humfrey's Library, Bodleiancatalogue record
- Oxyrhynchus Papyrus 840Duke Humfrey's Library, Bodleiancatalogue record