Region
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Montana
4
Nebraska
4
Netherlands
4
New Jersey
4
Northwest, Pacific
4
Ogallala Aquifer
4
Ohio
4
Portugal
4
Prince Edward Island
4
Scandinavia
4
South Dakota
4
Yunnan Sheng
4
Afghanistan
3
Africa, Central
3
Africa, Southern
3
Appalachian Region, Southern
3
Barbados
3
Boston
3
Burma
3
Butler County
3
Cambodia
3
Cauca River Valley
3
Chesapeake Bay Region (Md. and Va.)
3
Chiapas (Mexico)
3
Coachella Valley
3
Cochabamba Region
3
Cochabamba Region (Bolivia)
3
Conestoga River Watershed
3
Costa Rica
3
El Salvador
3
England, Southern
3
Everglades
3
Fiji
3
Greene County (Ga.)
3
Idaho
3
Ituri Forest
3
Jamaica
3
Jaén (Province)
3
Jaén (Spain : Province)
3
Jequetepeque River Valley
3
Jequetepeque River Valley (Peru)
3
Madagascar
3
Malawi
3
Manitoba
3
Mekong River Valley
3
Mexico, North
3
Naco Valley
3
Nile River
3
Northeastern States
3
Nova Scotia
3
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