Subject Region
United States
1,001
Great Britain
139
Argentina
115
California
114
France
80
India
73
Canada
65
New York (State)
63
Latin America
59
England
43
Germany
40
Europe
39
New York
39
Egypt
35
Spain
34
Japan
33
Africa
29
Developing countries
28
Australia
26
China
26
Italy
24
New Jersey
23
Iran
22
Middle East
21
Pennsylvania
21
Islamic countries
20
Arab countries
19
Asia
19
Mexico
19
Illinois
17
Michigan
17
San Francisco
17
Soviet Union
17
Israel
16
Washington (State)
16
Massachusetts
15
Caribbean Area
14
Chile
13
Florida
13
Morocco
13
North America
13
Connecticut
12
Ohio
12
Berkeley
11
Netherlands
11
Southern States
11
Texas
11
Espana
10
Indiana
10
Paris
10
more ...