Region
Africa
2
Alaska
1
Bolivia
1
Botswana
1
California
1
California, Southern
1
Caribbean Area
1
Chicago
1
Chile
1
China
2
Congo (Democratic Republic)
1
Developing countries
2
Europe
3
Europe, Central
1
Europe, Eastern
1
European Economic Community countries
1
Foreign countries
2
Idaho
1
Illinois
1
India
1
Iran
1
Iraq
1
Kansas
1
Latin America
2
Marshall Islands
1
Mexican-American Border Region
1
Mexico
2
Micronesia
1
Micronesia (Federated States)
1
Middle East
1
Minnesota
1
Minot
1
New Mexico
1
North Dakota
1
Oceania
1
Pennsylvania
1
Poland
1
Russia (Federation)
2
Rwanda
1
San Diego
1
San Luis Valley (Colo. and N.M.)
1
Somalia
1
South Africa
1
South Asia
1
South China Sea
1
Southeast Asia
1
Soviet Union
6
Thailand
1
Ukraine
1
United States
218
more ...