Geographic Subject
Germany
58
Soviet Union
23
India
9
United States
6
England
3
Iowa
3
Japan
3
Norway
3
Bangladesh
2
Finland
2
Germany (West)
2
Greece
2
Indonesia
2
Mexico
2
Pakistan
2
Sweden
2
Switzerland
2
Vaud
2
Vaud (Suisse)
2
Vaud (Switzerland)
2
6.140
1
Africa, Eastern
1
Africa, Southern
1
Asia
1
Austria
1
Belgium
1
Bulgaria
1
Bulgaria, 1925
1
Burma
1
Canada
1
Communist countries
1
Darussalam
1
Developing countries
1
France
1
Giessen (Hesse)
1
Great Britain
1
Malawi
1
Malaysia
1
Michigan
1
Minnesota
1
Nebraska
1
New York (State)
1
Oregon
1
Punjab
1
Punjab (State)
1
Russia
1
South Africa
1
South Dakota
1
Suisse
1
Tanzania
1
more ...