Region
United States
China
6
Europe
4
India
4
Great Britain
3
Russia (Federation)
3
Canada
2
Middle East
2
Soviet Union
2
Argentina
1
Asia, Central
1
Atlantic States
1
California, Northern
1
Cambodia
1
Colombia
1
East Asia
1
East China Sea
1
Iran
1
Japan
1
Korea (North)
1
Latin America
1
Liberia
1
Mexican-American Border Region
1
Mexico
1
Netherlands
1
Russia
1