Geographic Subject
Germany
19
Soviet Union
19
United States
15
France
12
India
12
Indonesia
9
Russia (Federation)
9
Switzerland
7
Poland
5
Africa
4
Uruguay
4
Argentina
3
Arctic regions
2
Germany (West)
2
Great Britain
2
New England
2
Africa, East
1
Africa, French-speaking Equatorial
1
Africa, Sub-Saharan
1
Africa, West
1
Ahaggar Mountains (Algeria)
1
Asia
1
Australasia
1
California
1
Developing countries
1
Ethiopia
1
Europe
1
European Economic Community countries
1
Hungary
1
Iran
1
Italy
1
Long Beach
1
Mauritania
1
Middle East
1
Netherlands
1
Peru
1
Polska
1
Saint Petersburg
1
Senegal
1
South Africa
1
Yugoslavia
1