Subject Region
United States
346
Great Britain
67
Canada
25
California
21
Québec (Province)
13
New York (State)
12
Australia
9
England
9
Germany
9
Pennsylvania
8
China
7
New York
7
Ireland
6
France
5
Philadelphia
5
Soviet Union
5
Afghanistan
4
Alabama
4
Chicago
4
Hong Kong
4
Illinois
4
Massachusetts
4
Scotland
4
Spain
4
Baltimore
3
Colombia
3
Espana
3
Florida
3
India
3
Indonesia
3
Iowa
3
Los Angeles
3
Maryland
3
New Jersey
3
San Francisco
3
Texas
3
Wales
3
Washington (D.C.)
3
Wisconsin
3
Aceh
2
Aceh (Indonesia)
2
Argentina
2
Bessemer
2
Boston
2
Brazil
2
Chile
2
Connecticut
2
Developing countries
2
Europe
2
Finland
2
more ...