United States 565
Soviet Union 41
Japan 19
Europe, Eastern 18
Developing countries 15
China 9
Europe 7
Hungary 7
Latin America 7
Asia 5
Israel 5
Africa 3
Cuba 3
Eastern Europe 3
Germany 3
Vietnam 3
Argentina 2
Europe, Central 2
France 2
Great Britain 2
Iran 2
Mexico 2
Southern States 2
Washington (D.C.) 2
Yugoslavia 2
Afghanistan 1
Antarctica 1
Australia 1
Austria 1
Bulgaria 1
Caribbean Area 1
Central America 1
Czechoslovakia 1
East Asia 1
Foreign countries 1
Germany (East) 1
Germany (West) 1
Guyana 1
Korea (South) 1
Mediterranean Region 1
Middle East 1
Netherlands 1
New Hampshire 1
Nicaragua 1
Pacific Area 1
Palestine 1
Philippines 1
Poland 1
South Africa 1
South America 1
Southeast Asia 1
Southwest, New 1
Southwestern States 1
Spain 1
Texas 1