Region
United States
506
Soviet Union
37
Europe, Eastern
13
Developing countries
10
Japan
10
China
6
Hungary
6
Africa
5
Asia
5
Europe
5
Middle East
5
Israel
4
Russia
4
California
3
Great Britain
3
Poland
3
Vietnam
3
East Asia
2
Europe, Central
2
Foreign countries
2
France
2
Germany
2
Germany (East)
2
Latin America
2
Persian Gulf Region
2
South America
2
Southern States
2
Alabama
1
Brooklyn (New York, N.Y.)
1
Central America
1
Communist countries
1
Cuba
1
Cyprus
1
Czechoslovakia
1
England
1
Germany (West)
1
Hiroshima-shi (Japan)
1
India
1
Iran
1
Korea (South)
1
Maryland
1
Massachusetts
1
Mexico
1
Missouri
1
New Hampshire
1
New York (N.Y.)
1
Outer space
1
Pacific Area
1
Southeast Asia
1
Southwest, New
1
more ...