Geography
United States
1,632 results
Texas
68 results
Developing countries
51 results
California
49 results
Europe
43 results
China
39 results
Canada
36 results
Soviet Union
36 results
Northwest, Pacific
29 results
Great Britain
24 results
India
22 results
Alaska
20 results
Asia
18 results
Mexico
17 results
Australia
16 results
Middle East
16 results
Brazil
15 results
Pacific Area
14 results
Colorado
13 results
Latin America
13 results
New Mexico
13 results
European Union countries
12 results
North America
12 results
Africa
11 results
Russia (Federation)
11 results
West (U.S.)
11 results
OECD countries
10 results
États-Unis
10 results
Former Soviet republics
8 results
Hawaii
8 results
Iran
8 results
Japan
8 results
Utah
8 results
Korea (North)
7 results
Washington (State)
7 results
Africa, Sub-Saharan
6 results
Caribbean Area
6 results
Europe, Eastern
6 results
European Economic Community countries
6 results
Pennsylvania
6 results
Saskatchewan
6 results
Alberta
5 results
Algeria
5 results
Arizona
5 results
Asia, Central
5 results
Caspian Sea Region
5 results
East Asia
5 results
France
5 results
Germany
5 results
Kentucky
5 results
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