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- Nīshāpūrī, Ḥusayn ibn Muḥammad, -1499. Muʻammayāt-i Ḥusaynī1
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- Odyssey (Homer)1
- Offenses against religion1
- Old age1
- On the generation of animals (Aristotle)1
- Ophthalmology1
- Opium1
- Orden de Santiago1
- Orders of knighthood and chivalry1
- Ordinatio (Duns Scotus, John)1