Region
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Nepal
1
Nepal --
1
Pakistan
1
Pakistan --
1
Saudi Arabia
1
Saudi Arabia --
1
Singapore
1
South Africa
1
South Africa --
1
Southeast Asia
4
Southeast Asia --
4
Southern States --
1
Soviet Union
2
Soviet Union --
2
Taiwan
2
Taiwan --
2
United States
8
United States --
7
United states --
1
Vietnam (Democratic Republic)
1
Vietnam (Democratic Republic) --
3
Yemen
1
Yemen (People's Democratic Republic)
2
Yemen (People's Democratic Republic) --
3
Yemen --
2
Yemen(People's Democratic Republic) --
1
Zaire --
1