- A
- Aa
- Aachen
- Aalborg
- Abracadabra
- Absalon
- Acrelius, Israel
- Acts of the Apostles
- Adams, John
- Adams, John Quincy
- Adirondack Mountains
- Adit
- Agardh, Karl Adolf
- Aimard, Gustave
- Aimé-Martin, Louis
- Aimon, or Aymon
- Ain
- Ain-Madhi
- Ainmüller, Maximilian Emanuel
- Ainos, or Ainns
- Ainsworth, Henry
- Ainsworth, Robert
- Ainsworth, William
- Aintab
- Air
- Air, or Asben
- Al
- Alabama
- Alabama (river)
- Alabaster
- Alaska
- Albany (counties)
- Albany (New York)
- Albany (district)
- Alcorn
- Alcott, Amos Bronson
- Alcott, William Alexander
- Aleutian Islands
- Alexandrian Codex
- Alexandrian Library
- Allouez, Claude Jean
- Alloy
- Almagro, Diego de
- Almali, or Elmalu
- Al-Mamoun, Abu Abbas Abdallah
- Almanac
- Al-Mansour, Abu Jaffar Abdallah
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