United States 592
Soviet Union 43
Europe, Eastern 20
Japan 15
Developing countries 11
China 10
Hungary 9
Europe 7
Africa 5
Asia 5
Middle East 5
Israel 4
Poland 4
Russia 4
California 3
Germany 3
Great Britain 3
Vietnam 3
Central America 2
Communist countries 2
Cuba 2
East Asia 2
Europe, Central 2
Foreign countries 2
France 2
Germany (East) 2
Latin America 2
Persian Gulf Region 2
South America 2
Southern States 2
Africa, Southern 1
Alabama 1
Antarctica 1
Berlin (Germany : West) 1
Berlin (Germany) 1
Bonin Islands 1
Bonin Islands (Japan) 1
Brooklyn (New York, N.Y.) 1
Caribbean Area 1
Cyprus 1
Czechoslovakia 1
Egypt 1
England 1
Europe, Western 1
Germany (West) 1
Hiroshima-chō (Japan) 1
Hiroshima-shi (Japan) 1
India 1
Iran 1
Iwo Jima (Volcano Islands) 1
Iwo Jima (Volcano Islands, Japan) 1
Korea (South) 1
Maryland 1
Massachusetts 1
Mexico 1
Missouri 1
New Hampshire 1
New York (N.Y.) 1
Northern Ireland 1
Outer space 1
Pacific Area 1
Romania 1
South Africa 1
Southeast Asia 1
Southwest, New 1
Syria 1
Texas 1
Tokyo (Japan) 1
Washington (D.C.) 1
Washington (State) 1
West Virginia 1
Western countries 1
Yucca Flat (Nev.) 1
Yugoslavia 1