- Accademic fiorentina1
- Account books1
- Acrostics1
- Actions and defenses1
- Adrian VI, Pope, 1459-15231
- Aegidius, Saint, Abbot1
- Agreda, Dominici d'1
- Agriculture1
- Alban, Saint, -304?1
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- Alchemy--Bibliography1
- Alexander III, Pope, -11811
- Alexander, de Villa Dei. Doctrinale puerorum1
- Alexius, Saint1
- Alfonso V, King of Aragon, 1396-14581
- Alfonso X, King of Castile and Leon, 1221-12841
- Alfīyah (Ibn Mālik, Muḥammad ibn ʻAbd Allāh)1
- Aljamía1