Geographic Subject
United States
145
India
64
Germany
47
Canada
24
France
23
Great Britain
22
Indonesia
19
Nigeria
16
Virginia
16
North Carolina
15
China
13
Prussia (Germany)
13
Pakistan
10
Mexico
9
Pennsylvania
9
Sweden
9
Argentina
8
South Africa
8
Massachusetts
7
Switzerland
7
Colorado
6
Cuba
6
New Hampshire
6
New York (State)
6
Soviet Union
6
Florida
5
Georgia
5
Germany (West)
5
Guyana
5
Haiti
5
Haïti
5
Mississippi
5
Prussia
5
Rome
5
Wisconsin
5
Arkansas
4
Brazil
4
Confederate States of America
4
Developing countries
4
Egypt
4
Illinois
4
Kenya
4
Malawi
4
Netherlands
4
Oklahoma
4
Papua New Guinea
4
Philippines
4
Rhode Island
4
Spain
4
Texas
4
more ...