Geographic Subject
Germany (West)
Germany
52
United States
51
France
48
4.415
30
European Economic Community countries
27
Great Britain
26
Switzerland
24
Germany (East)
9
Austria
8
Europe
7
Greece
6
Turkey
6
Korea (South)
5
Japan
4
Lower Saxony
4
North Rhine-Westphalia
4
Spain
4
Hamburg
3
Italy
3
Korea
3
Netherlands
3
Prussia
3
Soviet Union
3
Belgium
2
Berlin
2
Canada
2
Cologne
2
Developing countries
2
Hesse
2
Israel
2
Norway
2
Sweden
2
Ukraine
2
4.240
1
6.315
1
7.150
1
7.640
1
Africa, West
1
Allemagne (République-fédérale)
1
Arab countries
1
Argentina
1
Baden-Baden (Germany)
1
Baden-Württemberg
1
Bavaria
1
Bonn
1
Brazil
1
Bremen
1
China
1
Communist countries
1
more ...