Region
United States --
54
United States
41
Soviet Union
22
Soviet Union --
22
Europe --
11
Great Britain --
10
United states --
9
Germany --
7
Japan --
7
China --
6
Great Britain
6
Japan
6
Asia, Southeastern --
5
Europe
5
Asia, Southeastern
4
Germany
4
South Africa --
4
Asia
3
Asia --
3
Central America
3
Central America --
3
China
3
East Asia --
3
France --
3
India
3
India --
3
Israel
3
Israel --
3
Latin America
3
Latin America --
3
Romania --
3
Singapore
3
Singapore --
3
South Africa
3
Spain --
3
Turkey
3
Turkey --
3
Africa, Southern --
2
Australia --
2
East Asia
2
Egypt
2
Egypt --
2
Europe, Eastern
2
Europe, Eastern --
2
France
2
Germany (West) --
2
Greece
2
Greece --
2
Indonesia
2
Indonesia --
2
more ...