Région
Germany (West)
70
Germany
57
Switzerland
11
United States
7
4.415
5
Great Britain
5
Italy
2
North Rhine-Westphalia
2
4.660
1
Austria
1
Berlin. Freie Universität
1
Canada
1
Egypt
1
Europe
1
European Economic Community countries
1
Foreign countries
1
France
1
Germeny
1
Hamburg
1
Hesse
1
Hohenlohe
1
Netherlands
1
Panama
1
Prussia
1
Rhineland
1
South Africa
1
Soviet Union
1
Spain
1
Taiwan
1
Zurich (Canton)
1