Region
Balkan Peninsula
Germany
13
Europe
6
Bulgaria
4
Europe, Eastern
3
Great Britain
3
United States
3
Yugoslavia
3
Danube River
2
Europe, Central
2
Africa
1
Africa, North
1
Blakan Peninsula
1
Central Europe
1
Danube River Region
1
Deutschland
1
Eastern Europe
1
Italy
1
Mediterranean Region
1
Middle East
1
Romania
1
Soviet Union
1