Subject Region
United States
53
Europe
13
Great Britain
10
East Asia
3
Greece
3
India
3
Mexico
3
Rome
3
China
2
European Union countries
2
Netherlands
2
South Africa
2
Southeast Asia
2
Soviet Union
2
Angola
1
Antwerp
1
Asia
1
Belgium
1
Cameroon
1
Espana
1
France
1
Israel
1
Latin America
1
Medicine Bow Mountains (Colo. and Wyo.)
1
Micronesia
1
Papua New Guinea
1
Singapore
1
Southwest, New
1
Spain
1
Switzerland
1
Western countries
1