Region
United States
87
Great Britain
16
California
15
Ohio
10
Iowa
8
Michigan
8
England
7
Illinois
6
New York (State)
6
Chicago
5
Cleveland
5
London
5
Massachusetts
5
New York
5
Berkeley
4
France
4
Los Angeles
4
San Francisco
4
Texas
4
Ann Arbor
3
Germany
3
Washington (D.C.)
3
Africa, Sub-Saharan
2
Ames
2
Boston
2
Columbus
2
Des Moines
2
Developing countries
2
Egypt
2
Germany (West)
2
Grinnell
2
Iowa City
2
London (England)
2
20th century
1
Africa
1
Albany
1
Ann Arbor (Mich.)
1
Arizona
1
Austin
1
Berlin
1
British Columbia
1
Burnaby
1
Cambridge
1
Canada
1
Canyon
1
Champaign
1
Cincinnati
1
Colorado
1
Dallas
1
Dayton
1
more ...