Region
United States
107
Great Britain
25
Europe
18
California
14
New York (State)
12
England
10
New York
10
London
8
Ohio
8
Iowa
7
China
6
Illinois
6
Massachusetts
6
Michigan
6
Chicago
5
Cleveland
5
Germany (West)
5
Italy
5
San Francisco
5
Arab countries
4
Berkeley
4
Developing countries
4
France
4
Spain
4
Texas
4
Boston
3
Europe, Western
3
London (England)
3
Los Angeles
3
Paris
3
Soviet Union
3
Washington (D.C.)
3
Africa, Sub-Saharan
2
Ames
2
Ann Arbor
2
Beijing
2
Cambridge
2
Des Moines
2
Europe, Eastern
2
Genoa
2
Germany (East)
2
Greece
2
Iowa City
2
Japan
2
Middle East
2
Northern Ireland
2
20th century
1
Africa
1
Africa, North
1
Albany
1
more ...