Geographic Subject
United States
21
Switzerland
20
Germany
14
Soviet Union
12
India
11
Europe
10
France
8
Germany (West)
8
Poland
8
Great Britain
7
Argentina
5
Cuba
4
Netherlands
3
Amérique latine
2
Belgium
2
European Economic Community countries
2
Indonesia
2
Latin America
2
Mexico
2
Suisse
2
États-Unis
2
Africa
1
Asia
1
Finland
1
Inde
1
Japan
1
Peru
1
Pérou
1
Sweden
1
Thailand
1
Washington (D.C.)
1
Yugoslavia
1