Region
United States
97
Great Britain
22
Soviet Union
12
Germany
9
France
8
India
7
Poland
6
China
5
England
5
Europe
5
Europe, Eastern
5
Spain
5
Colombia
4
Colorado
4
Ireland
4
Vietnam
4
Argentina
3
Asia, Eastern
3
Austria
3
East Asia
3
Japan
3
London
3
Alaska
2
Algeria
2
Asia
2
California
2
Cuba
2
Czechoslovakia
2
Developing countries
2
Florida
2
Iran
2
Israel
2
Italy
2
Korea
2
Latin America
2
Middle East
2
Outer space
2
Paris
2
Scotland
2
Southern States
2
West (U.S.)
2
Alsace
1
America
1
Berlin
1
Berlin (Germany)
1
Birobidzhan (Russia)
1
Boulder County
1
Boulder County (Colo.)
1
Brazil
1
Brown v. Board of Education National Historic Site (Topeka, Kan.)
1
more ...