Geography
United States
1,678 results
China
32 results
Developing countries
32 results
European Economic Community countries
23 results
Mexico
23 results
Europe
17 results
Japan
16 results
California
15 results
Southern States
15 results
Europe, Eastern
14 results
Soviet Union
13 results
Africa
12 results
Canada
11 results
Florida
11 results
North America
10 results
Egypt
9 results
India
9 results
West (U.S.)
9 results
Texas
8 results
Australia
7 results
Brazil
7 results
Latin America
7 results
Nebraska
7 results
Spain
7 results
East Asia
6 results
Great Plains
6 results
Middle East
6 results
Pennsylvania
6 results
Africa, Sub-Saharan
5 results
Asia
5 results
European Union countries
5 results
Former Soviet republics
5 results
Georgia
5 results
Missouri
5 results
Ohio
5 results
Oklahoma
5 results
Vermont
5 results
Western Hemisphere
5 results
États-Unis
5 results
Arizona
4 results
Arkansas
4 results
Dominican Republic
4 results
Idaho
4 results
Illinois
4 results
Iowa
4 results
Nigeria
4 results
Portugal
4 results
Tennessee
4 results
Washington (State)
4 results
Alabama
3 results
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