- Animals in human situations1
- Anti-Catholicism2
- Antislavery movements1
- Appointment, call, and election1
- Appropriations and expenditures1
- Arbors (Bowers)1
- Arches1
- Archives1
- Armor1
- Arms & armament2
- Art and mental illness1
- Artists' materials6
- Assassination1
- Assassinations1
- Attainder1
- Auctions2
- Authors and patrons1
- Axes4
- Badgers3
- Bags3