Subject Region
United States
849
Soviet Union
329
Europe
84
Great Britain
79
Germany
53
China
46
Europe, Eastern
40
Canada
29
Germany (East)
29
Latin America
28
Germany (West)
27
Communist countries
26
Europe, Western
21
Asia
20
France
20
Berlin (Germany)
19
Japan
19
Russia (Federation)
16
Developing countries
15
Middle East
14
Cuba
12
Africa
10
Berlin
10
India
9
Mexico
9
Yugoslavia
9
Brazil
8
Austria
7
East Asia
7
Italy
7
Moscow (Russia)
7
Russia
7
Southeast Asia
7
Turkey
7
California
6
Hungary
6
Pacific Area
6
Poland
6
South Africa
6
Bulgaria
5
Hong Kong
5
New Mexico
5
Pakistan
5
Romania
5
Western countries
5
Africa, Southern
4
Australia
4
Chile
4
Czechoslovakia
4
England
4
more ...