Region
Afghanistan
1
Asia
6
Australia
1
Canada
1
Caribbean Area
1
China
1
Communist countries
3
Connecticut
1
Czechoslovakia
1
Developing countries
6
East Asia
1
Europe
2
Europe, Eastern
2
Great Britain
4
Hungary
4
India
1
Israel
1
Japan
1
Latin America
1
Middle East
2
New York (State)
1
Nicaragua
3
Pacific Area
1
Poland
1
South Africa
2
Southeast Asia
1
Southern States
5
Soviet Union
9
Texas
1
Tibet Autonomous Region (China)
1
United States
138
Vietnam
3
Washington (D.C.)
3
Zimbabwe
1