Subject Region
1980-1989
1
1990-1999
3
Aberystwyth (Wales)
1
Abkhazia (Georgia)
1
Afghanistan
10
Africa
14
Africa, Central
1
Africa, North
2
Africa, Sub-Saharan
1
Africa, West
2
Alabama
5
Alamo (San Antonio, Tex.)
1
Alaska
7
Albuquerque
6
Alexandra (Johannesburg)
1
Alexandria
1
Algeria
6
Algiers
1
Alps, French (France)
1
Altar Valley
1
Amazon River Region
3
Amchitka Island
1
America
2
Amsterdam
1
Anniston (Ala.)
1
Antarctica
2
Appalachian Mountains
1
Arab countries
2
Arcadia
1
Arcadia (Calif.)
1
Arctic National Wildlife Refuge
1
Arctic National Wildlife Refuge (Alaska)
1
Arctic regions
2
Argentina
3
Arizona
6
Arkansas
1
Asheville (N.C.)
1
Asia
1
Asia, Central
1
Aswan Dam (Egypt)
1
Athens (Greece)
2
Atlanta
5
Atlanta (Ga.)
1
Atlantic City
7
Atlantic City (N.J.)
1
Atlantic Ocean
2
Augusta
1
Augusta (Me.)
1
Austin
2
Austin (Tex.)
1
more ...