Region
United States
18
Soviet Union
11
Great Britain
6
Germany
3
Poland
2
Berlin
1
Berlin (Germany)
1
Bletchley Park (Milton Keynes, England)
1
Bucharest (Romania)
1
Communist countries
1
Congo (Democratic Republic)
1
Cuba
1
Former communist countries
1
Germany (East)
1
Ireland
1
Japan
1
Middle East
1
Mississippi
1
Romania
1
Russia
1