- Alchemy--Bibliography1
- Aleramo, Marquis of Monferrato, -9671
- Alexander Balas, King of Syria, -145 B.C.1
- Alexander, de Villa Dei. Doctrinale puerorum1
- Alfonso II, King of Naples, 1448-14951
- Ambrose, Saint, Bishop of Milan, -3971
- Amelius, Martyr1
- Amicus, Martyr1
- Andria (Terence)1
- Annals and chronicles1
- Anne (Mother of the Virgin Mary), Saint1
- Anthropomorphic letters1
- Antiphonaries--Manuscripts1
- Apocryphal books (Old Testament)1
- Apollonius, of Tyana1
- Apostles in art1
- Archives1
- Arithmetic--Study and teaching1
- Armies1
- Armorial bindings1