Subject Region
China
22
Developing countries
13
India
11
Mexico
9
Europe
8
Latin America
6
South Africa
5
Colombia
4
Great Britain
4
Africa, West
3
America Latina
3
Asia
3
Ecuador
3
Europe, Eastern
3
European Union countries
3
Nigeria
3
Papua New Guinea
3
United States
3
Africa
2
Africa, Sub-Saharan
2
Azerbaijan
2
Brazil
2
Eastern Cape
2
Jiangxi Sheng
2
Jordan River Valley
2
Africa, East
1
Argentina
1
Australia
1
Balkan Peninsula
1
Bangladesh
1
Belgium
1
Black Belt (Ala. and Miss.)
1
Bolivia
1
Campeche (Mexico : State)
1
Campeche (State)
1
Canada
1
Caribbean Area
1
Chiapas
1
Chiapas (Mexico)
1
Congo (Democratic Republic)
1
Cross River State
1
Cross River State (Nigeria)
1
England
1
Espana
1
Ethiopia
1
Europe, Central
1
France
1
Ghana
1
Great Plains
1
Guatemala
1
more ...