Region
United States --
20
United States
16
Soviet Union
3
Soviet Union --
3
China
2
China --
2
Europe
2
Europe --
2
Taiwan --
2
Africa, Northeast
1
Africa, Northeast --
1
Asia
1
Asia --
1
Asia, Southeastern
1
Asia, Southeastern --
1
Central America
1
Central America --
1
Cuba
1
Cuba --
1
Finland
1
Finland --
1
Malaysia
1
Pacific Area
1
Pacific Area --
1
Southeast Asia
1
Southeast Asia --
1
Taiwan
1