Region
United States
454
Soviet Union
17
Great Britain
15
Iraq
14
Mexico, Gulf of
12
Washington (D.C.)
12
California
9
Russia
6
China
5
Europe
5
Europe, Eastern
5
India
5
Middle East
5
Southeast Asia
5
Africa
4
France
4
Pennsylvania
4
Spain
4
Asia
3
Bangladesh
3
Chile
3
Colorado
3
East Asia
3
England
3
Germany
3
Poland
3
Rome
3
Turkey
3
Yemen (Republic)
3
Afghanistan
2
Africa South of the Sahara
2
Africa, Sub-Saharan
2
Alabama
2
Arctic regions
2
Argentina
2
Bosnia and Herzegovina
2
Canada
2
Croatia
2
Cuba
2
Czechoslovakia
2
Developing countries
2
Ecuador
2
English-speaking countries
2
Foreign countries
2
Former Soviet republics
2
Greece
2
India, North
2
Iran
2
Ireland
2
Los Angeles
2
more ...