Subject Region
United States
98
Mexico
60
Europe
24
Germany
22
Africa
20
Great Britain
17
Australia
12
France
12
Latin America
12
America
11
Japan
11
North America
10
Papua New Guinea
10
Canada
9
Middle East
9
Spain
9
Asia
8
Brazil
8
Greece
8
Argentina
7
Colombia
7
England
7
India
6
Oceania
6
Peru
6
Chile
5
Espana
5
Indonesia
5
America Latina
4
China
4
Islamic countries
4
Israel
4
Italy
4
Melanesia
4
Morocco
4
Russia
4
Taiwan
4
Tasmania
4
Africa, East
3
Africa, North
3
Africa, Southern
3
Florida
3
New Guinea
3
Oxford
3
Southeast Asia
3
Southern States
3
Southwest, New
3
Soviet Union
3
Turkey
3
Africa, Eastern
2
more ...