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- Aeronautics, Military--United States--History--19th century1
- Alismatales1
- Alnus1
- Amaranthaceae1
- Amblystegiaceae11
- Amblystegium1
- Anomodon5
- Antietam, Battle of, Md., 18622
- Antietam, Battle of, Md., 1862--Casualties2
- Apiaceae1
- Apiales1
- Aristida1
- Asparagales1
- Asteraceae14
- Asterales15
- Atrichum5
- Aulacomniaceae5
- Aulacomnium5
- Automobiles2
- Bacidia3