Region
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Antarctica
5
East Asia
5
Louisiana
5
Massachusetts
5
Northwest, Pacific
5
Québec (Province)
5
Sweden
5
Tanzania
5
Washington (State)
5
Western Hemisphere
5
Africa, Southern
4
Arizona
4
Canada, Northern
4
Germany (West)
4
Hudson River Valley (N.Y. and N.J.)
4
Los Angeles
4
New Jersey
4
Philippines
4
South Africa
4
Spain
4
Tellico Dam (Tenn.)
4
Turkey
4
Zimbabwe
4
Africa, Sub-Saharan
3
Argentina
3
Baltic Sea
3
British Columbia
3
Chicago
3
Clayoquot Sound Region
3
Cuba
3
Developed countries
3
Ethiopia
3
Former Soviet republics
3
Illinois
3
Indiana
3
Malaysia
3
Mali
3
Mexico City
3
Middle East
3
Morocco
3
Nebraska
3
Nevada
3
New Orleans
3
OECD countries
3
Oregon
3
Poland
3
Russia
3
Singapore
3
South Asia
3
Southwest, New
3
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