Geographic Subject
Germany
251
Germany (West)
42
Hesse
32
4.415
14
Giessen
11
Rome
10
Prussia
8
Greece
7
France
6
Iran
6
Turkey
6
Europe
5
Great Britain
5
Belgium
4
Deutschland
4
Giessen (Hesse, Germany)
4
Hesse (Germany)
4
Italy
4
Mainz (Rhineland-Palatinate, Germany)
4
Soviet Union
4
Spain
4
United States
4
Wetterau
4
Württemberg
4
England
3
Giessen (Hesse)
3
Hesse-Darmstadt (Grand duchy)
3
Hungary
3
Lahn Valley
3
Mainz
3
Romania
3
Saarland
3
Aachen
2
Africa
2
Austria
2
Bonn
2
Darmstadt
2
Developing countries
2
Egypt
2
Eleusis
2
Ethiopia
2
Hesse-Kassel (Electorate)
2
Japan
2
Kenya
2
Korea (South)
2
Namibia
2
Netherlands
2
Syria
2
Tropics
2
Vogelsberg
2
more ...