Region
United States --
20
United States
16
Asia
10
Asia --
10
Soviet Union
7
Soviet Union --
7
Asia, Southeastern --
6
Europe
6
Europe --
6
China --
5
Pacific Area
5
Pacific Area --
5
Southeast Asia
5
Asia, Southeastern
4
China
4
Europe, Eastern --
4
Japan --
4
Southeast Asia --
4
Europe, Eastern
3
Russia
3
Russia --
3
ASEAN countries --
2
Burma
2
Burma --
2
East Asia --
2
Former Soviet republics --
2
Great Britain
2
Great Britain --
2
Indochina
2
Indochina --
2
Indonesia
2
Indonesia --
2
Israel --
2
Korea (South)
2
Korea (South) --
2
Singapore --
2
Taiwan --
2
ASEAN countries
1
Africa
1
Africa --
1
Africa, Northeast
1
Africa, Northeast --
1
Africa, Southern --
1
Arctic regions --
1
Argentina
1
Argentina --
1
Asia, southeastern --
1
Australia
1
Australia --
1
Austria
1
more ...