Subject Region
United States
128
China
108
Developing countries
45
India
40
Mexico
40
Africa
37
Europe
35
Latin America
31
Spain
27
Italy
25
Colombia
24
Espana
24
Great Britain
23
Asia
22
Middle East
20
Rome
20
Southern States
17
Japan
16
England
15
Canada
14
Pennsylvania
14
California
12
West (U.S.)
12
East Asia
11
Southeast Asia
11
Argentina
10
Egypt
10
Germany
10
New York (State)
10
Philadelphia
10
Australia
9
France
9
Israel
9
New York
9
Chile
8
Pacific Area
8
South Asia
8
Tanzania
8
America Latina
7
Illinois
7
Mexico City
7
Vietnam
7
Africa, Sub-Saharan
6
America
6
Bogota
6
Brazil
6
Cairo
6
Cairo (Egypt)
6
Middle West
6
Pearl River Delta
6
more ...