Region
United States
624
Great Britain
51
Canada
41
Greece
35
Europe
22
England
17
China
15
North Carolina
15
New York (State)
13
Soviet Union
12
New York
11
South Africa
11
Asia
10
Australia
10
California
8
Germany
8
Rome
8
Texas
8
France
7
Ireland
7
Latin America
7
Pennsylvania
7
Chapel Hill
6
Developing countries
6
Illinois
6
Japan
6
Spain
6
Chicago
5
India
5
Korea
5
Massachusetts
5
Tennessee
5
Washington (State)
5
Argentina
4
Iowa
4
Korea (South)
4
Mexico
4
Minnesota
4
New York (N.Y.)
4
North America
4
Philadelphia
4
South Carolina
4
Africa
3
Alberta
3
Boston (Mass.)
3
Caribbean Area
3
Czech Republic
3
Czechoslovakia
3
European Union countries
3
Kansas
3
more ...