Geographic Subject
United States
280
Maryland
21
Great Britain
20
South Africa
15
India
14
America
12
Sweden
11
Canada
8
Mexico
7
France
6
North America
6
Pennsylvania
6
Utah
6
Virginia
6
Washington (State)
6
Georgia
5
New Mexico
5
Russia (Federation)
5
Soviet Union
5
Thailand
5
China
4
Egypt
4
England
4
Germany
4
Hawaii
4
Michigan
4
Ohio
4
Poland
4
Southern States
4
États-Unis
4
Africa
3
Arizona
3
Asia
3
Baltimore
3
Congo (Democratic Republic)
3
Cuba
3
Europe
3
Italy
3
Johannesburg
3
New England
3
New Zealand
3
Oklahoma
3
Spain
3
Tennessee
3
West Indies
3
Amérique du Nord
2
Argentina
2
Arkansas
2
Australia
2
Baltimore (Md.)
2
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