- Abravanel, Isaac, 1437-15081
- Academic theses1
- Action and adventure fiction1
- Actions and defenses1
- Adarve, Lazardo del1
- Administration1
- Adventure stories, Spanish1
- Aeneis (Virgil)1
- Aggada1
- Agustín, Antonio, 1517-1586. Dialogos de medallas inscriciones y otras antiguedades1
- Alba, Fernando Alvarez de Toledo, duque de, 1507-15821
- Albigenses1
- Alchemy1
- Alchemy--Manuscripts1
- Alexander, the Great, 356 B.C.-323 B.C.1
- Alfonso I King of Asturias, 693-7561
- Alfonso III, King of Asturias and Leon, approximately 848-approximately 9101
- Alfonso V, King of Asturias and León, 994-1027 or 10281
- Alfonso VI, King of Castile and Leon, 1030-11091
- Alfonso VII, The Emperor, King of Castile, 1104-11571