Subject Region
United States
124
Developing countries
68
Europe
63
Great Britain
49
China
34
Japan
14
Spain
14
France
13
Mexico
13
Espana
12
Germany
12
Europe, Eastern
10
India
10
Africa
9
Russia (Federation)
9
Asia
7
Peru
7
Soviet Union
7
Argentina
6
Canada
6
East Asia
6
England
6
Hungary
6
Latin America
6
Austria
5
Colombia
5
Developed countries
5
America Latina
4
Brazil
4
Europa
4
Germany (West)
4
Greece
4
New York (State)
4
Puerto Rico
4
Yugoslavia
4
Australia
3
Chile
3
Europe, Central
3
European Economic Community countries
3
Italy
3
Missouri
3
Pacific Area
3
Rome
3
South Africa
3
South Asia
3
Turkey
3
Africa, Sub-Saharan
2
America
2
Arabian Peninsula
2
Assyria
2
more ...