Geographic Subject
Germany
9
Soviet Union
9
Poland
4
France
3
Russia (Federation)
3
Spain
3
Africa
2
Azerbaijan
2
China
2
Chine
2
Greece
2
India
2
Indonesia
2
Mexico
2
Russia
2
Switzerland
2
4.430
1
Allemagne
1
Europe
1
Europe, Eastern
1
Greenland
1
Italy
1
Kenya
1
Latin America
1
Nigeria
1
Pologne
1
Sweden
1
Tanzania
1
Yugoslavia
1