Geographic Subject
United States
23
India
9
Russia (Federation)
8
Netherlands
7
France
6
Germany
6
Soviet Union
4
Switzerland
4
Venezuela
3
Bangladesh
2
Cuba
2
Germany (West)
2
Great Britain
2
Hungary
2
Siberia
2
Argentina
1
Developing countries
1
European Union countries
1
Indonesia
1
Japan
1
Jurisp
1
Morocco
1
Pakistan
1
Scotland
1
Washington (D.C.)
1
Yugoslavia
1
États-Unis
1