Subject Region
United States
465
England
281
Great Britain
193
Argentina
125
Cuba
125
India
117
Developing countries
102
Mexico
93
Ireland
72
China
70
Europe
60
Africa
55
Southern States
55
Scotland
53
Brazil
40
France
37
Spain
37
Australia
35
California
34
Japan
34
Tropics
32
Canada
30
Latin America
30
Rome
27
Soviet Union
27
Peru
23
Indonesia
22
Asia
21
New York (State)
20
Africa, Sub-Saharan
19
Colombia
19
Great Plains
18
Iowa
18
Italy
18
North America
18
Pennsylvania
18
Wales
18
America
17
Ethiopia
17
Middle West
16
New England
16
West Country
16
Egypt
15
Greece
15
Ontario
15
Georgia
14
Belgium
12
Ecuador
12
Espana
12
Europe, Eastern
12
more ...