Region
United States
30
Soviet Union
28
China
23
Communist countries
13
Europe, Eastern
13
Great Britain
13
Europe
11
Germany
10
France
6
Germany (East)
4
Russia
4
Yugoslavia
4
Czechoslovakia
3
Spain
3
Bulgaria
2
Developing countries
2
Hungary
2
Italy
2
Romania
2
Russia (Federation)
2
Saxony (Germany)
2
Afghanistan
1
Africa
1
Algeria
1
Asia, Southeastern
1
Austria
1
Berlin (Germany)
1
Birobidzhan (Russia)
1
Caribbean Area
1
China (People's Republic of China, 1949- )
1
Croatia
1
Eastern Europe
1
Europe, Southern
1
Europe, Western
1
Evreĭskai͡a avtonomnai͡a oblastʹ (Russia)
1
Former Soviet republics
1
Guangxi Zhuangzu Zizhiqu
1
Hunan Sheng
1
Hunan Sheng (China)
1
Indonesia
1
Ireland
1
Jiangsu Sheng (China)
1
Jiangxi Sheng
1
Kronshtadt (Russia)
1
Latvia
1
Leningrad
1
Poland
1
Portugal
1
Prussia
1
Saxony
1
more ...