Geographic Subject
Indonesia
19
China
17
India
16
United States
15
Germany
12
Russia (Federation)
8
Japan
7
Soviet Union
6
France
4
Netherlands
4
Africa, Sub-Saharan
3
Canada
3
Developing countries
3
Guangdong Sheng
3
Iowa
3
Russia
3
Sichuan Sheng
3
Sweden
3
Switzerland
3
Thailand
3
Algeria
2
Benin
2
Berlin
2
Egypt
2
Germany (West)
2
Great Britain
2
Latin America
2
Middle West
2
Odisha
2
Poland
2
Sri Lanka
2
Yugoslavia
2
4.050
1
4.415
1
6.510
1
Aargau
1
Africa
1
Afrique noire
1
Amsterdam
1
Arab countries
1
Argentina
1
Armenia (Republic)
1
Asie du Sud-Est
1
Asie méridionale
1
Austin
1
Australia
1
Austria
1
Baikal, Lake, Region
1
Bali
1
Bas-Rhin
1
more ...