Region
United States --
18
United States
17
China --
7
Great Britain
6
Great Britain --
6
Indonesia
5
Indonesia --
5
Vietnam --
5
China
4
Vietnam
4
Europe
3
Europe --
3
Malaysia --
3
Palestine --
3
Romania
3
Romania --
3
Soviet Union --
3
Asia
2
Asia --
2
Asia, Southeastern
2
Asia, Southeastern --
2
Cambodia --
2
Germany --
2
Hungary
2
Hungary --
2
Indochina
2
Indochina --
2
Israel --
2
Japan --
2
Libya
2
Libya --
2
Malaysia
2
Panama --
2
Russia --
2
Singapore
2
Singapore --
2
Soviet Union
2
United states --
2
1945-1975
1
Afghanistan --
1
Australia
1
Australia --
1
Cambodia
1
Central America
1
Central America --
1
Chad
1
Chad --
1
Chile
1
Chile --
1
Developing countries --
1
more ...