| 2526 | CIC1.10 | M. Tullius Cicero | Orator | da |
| 2527 | COM2.1 | Jan Amos Comenius | Orbis Sensualium Pictus | da |
| 2528 | SCH1.1 | Schachten, Winfried H. J. | Ordo salutis : das Gesetz als Weise der Heilsvermittlung ; zur Kritik des hl. Thomas von Aquin an Joachim von Fiore | da |
| 2529 | SOR2.1 | Sorel, Reynal | Orfeu şi orfismul | da |
| 2530 | MAI3.1 | Maier, Friedrich; Zeller, Alfred | Organon: Grammatik II. Sazlehre | da |
| 2531 | Orie46 | *** | ORIENS. Journal of Philosophy, Theology and Science in the Islamic Societies | da |
| 2532 | CRO4.1 | Crouzel, Henri | Origène et Plotin: comparaisons doctrinales | da |
| 2533 | VER2.1 | Vernant, Jean-Pierre | Originile gandirii grecesti | da |
| 2534 | MON3.1 | Monagle, Clare | Orthodoxy and controversy in twelfth-century religious discourse. Peter Lombard's Sentences and the development of theology | da |
| 2535 | BIB6.1.1 | Feldman, Louis H.; Kugel, L. James; Schiffman, Lawrence H. (eds.) | Outside the Bible: ancient Jewish writings related to scripture (vol. I) | da |
