Geographic Subject
United States
88
Soviet Union
71
Germany
36
Great Britain
31
France
24
China
22
Europe
21
Russia
16
Poland
15
India
14
Japan
14
Latin America
10
Pakistan
10
Turkey
9
Africa
7
Germany (West)
7
Italy
7
Middle East
7
East Asia
6
Europe, Eastern
6
Argentina
4
Mexico
4
Pacific Area
4
Arab countries
3
Asia
3
Asia, Central
3
Balkan Peninsula
3
Canada
3
Communist countries
3
Cuba
3
Europe, Central
3
Finland
3
Jammu and Kashmir (India)
3
Mediterranean Region
3
Portugal
3
Romania
3
Afghanistan
2
Africa, Southern
2
Chile
2
Czechoslovakia
2
Egypt
2
Holy Roman Empire
2
Indian Ocean Region
2
Iran
2
Netherlands
2
Oceania
2
Scandinavia
2
South Africa
2
Spain
2
Sweden
2
more ...