Geographic Subject
United States
63
Nicaragua
4
Soviet Union
4
Brazil
3
Liberia
3
Turkey
3
Austria
2
Colombia
2
Costa Rica
2
Ethiopia
2
France
2
Greece
2
Honduras
2
Hungary
2
Madagascar
2
Romania
2
Yugoslavia
2
Africa, Southern
1
Angola
1
Argentina
1
Balkan Peninsula
1
Baltic States
1
Central America
1
China
1
Congo (Democratic Republic)
1
Cuba
1
Czechoslovakia
1
Egypt
1
El Salvador
1
Europe, Eastern
1
Gabon
1
Germany
1
Guam
1
Guatemala
1
Japan
1
Korea
1
Latin America
1
Latvia
1
Lithuania
1
Mexico
1
Morocco
1
Panama
1
Rio Grande (Rio Grande do Sul, Brazil)
1
Ríohacha (Colombia)
1
Saint Helena
1
Senegal
1
Serbia
1
Sierra Leone
1
South Africa
1
Spain
1
more ...