Region
United States
51
Great Britain
37
European Union countries
12
England
4
Japan
4
Soviet Union
3
Europe
2
Europe, Western
2
Germany
2
Afghanistan
1
Africa, Sub-Saharan
1
Arab countries
1
Asia
1
Balkan Peninsula
1
Case studies
1
Developing countries
1
European Union
1
European union countries
1
France
1
Germany (Federal Republic, 1949- )
1
Germany (West)
1
Holy Roman Empire
1
Kosovo (Serbia)
1
Latin America
1
Lebanon
1
Mexico, Gulf of
1
North Sea Region
1
Russia (Federation)
1
South Africa
1
Swindon, Wiltshire
1
Syria
1
West Midlands
1