Region
Abisko
1
Africa
1
Africa, Sub-Saharan
2
Alabama
1
Alaska
1
Alps, Swiss
1
Angleterre
1
Arctic regions
1
Argentina
5
Arkansas
1
Asia
3
Atlanta
1
Atlantic Ocean
1
Austin
1
Australia
19
Australia, Northern
1
Ayacucho
1
Beaufort Sea
1
Berkeley
1
Berlin
2
Boston
4
Boulder
2
Boulder (Colo.)
1
Brazil
3
Buenos Aires
1
Burkina Faso
1
California
5
California, Northern
1
Canada
29
Canada, Northern
1
Caribbean Area
2
Chattanooga
1
Chicago
4
China
5
Cleveland Region
1
Clinton County (Ind.)
1
Colombia
3
Colorado
2
Columbia River
1
Communist countries
1
Coos Bay Estuary
1
Cowlitz River Watershed
1
Cuba
8
Czechoslovakia
1
Denmark
3
Developing countries
1
East Asia
2
El Salvador
2
England
6
Enugu State
1
more ...