Subject Region
United States
299
France
55
Great Britain
43
New York (State)
36
California
31
New York
31
Germany
29
Canada
24
China
23
India
23
Japan
20
Israel
19
Africa
18
Los Angeles
15
Netherlands
13
England
12
Mexico
12
Pennsylvania
12
Europe
11
Illinois
11
Texas
11
Poland
10
Developing countries
9
South Africa
9
Austria
8
Chicago
8
Italy
8
Kenya
8
Russia
8
Russia (Federation)
8
Soviet Union
8
Spain
8
Afghanistan
7
Congo (Democratic Republic)
7
Iran
7
Pakistan
7
Uganda
7
Africa, West
6
Cuba
6
Denmark
6
Philadelphia
6
Sweden
6
Alabama
5
Argentina
5
Arizona
5
Australia
5
Brazil
5
Ghana
5
Greece
5
Latin America
5
more ...