Geographic Subject
United States
92
Soviet Union
5
Iran
3
Asia, Southeastern
2
East Asia
2
Europe, Eastern
2
Great Britain
2
Africa
1
America
1
Asia
1
Canada
1
China
1
Cuba
1
Developing countries
1
Europe
1
Germany
1
Germany (West)
1
India
1
Indonesia
1
Israel
1
Korea
1
Korea (South)
1
Latin America
1
Manchuria
1
Manchuria (China)
1
Middle East
1
Saudi Arabia
1
Thailand
1