Subject
- American chestnut1
- Amis, Martin1
- Amphibians1
- Amur River Valley (China and Russia)1
- Amur Tiger1
- Anacostia River (Md. and Washington, D.C.)--Environmental conditions.1
- Angel Falls (Venezuela)1
- Animal Damage Control Program (U.S.)1
- Animal welfare1
- Anthrax1
- Antiasthmatic agents1
- Apache National Forest (Ariz.)1
- Apologies1
- Appalachian Trail9
- Apple growers1
- Apples--Breeding1
- Apportionment (Election law)--New York (State)3
- Aquaculture1
- Aquariums1
- Archaeological sites--Management1