Region
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Italy
3
Kent
3
Kentucky
3
Louisiana
3
Mexico
3
Michigan
3
Nebraska
3
North Dakota
3
North Slope (Alaska)
3
Pennsylvania
3
Russia
3
San Francisco Bay Area
3
South Carolina
3
Southwestern States
3
Africa, Sub-Saharan
2
Africa, West
2
Amazon River Region
2
America
2
Antarctica
2
Arkansas
2
Austria
2
Bedford County
2
Brazil
2
Caribbean Area
2
Cauca (Department)
2
Chesapeake Bay Watershed
2
Clark County
2
Clark Fork (Mont. and Idaho)
2
Cold regions
2
Ethiopia
2
Fairfax County
2
Fukushima-ken
2
Germany
2
Greece
2
Illinois
2
Indiana
2
Jefferson County
2
Kesterson National Wildlife Refuge
2
Kesterson National Wildlife Refuge (Calif.)
2
Knox County
2
Lawrence County
2
Mali
2
Maragoli (Kenya)
2
Maragoli Region
2
Maryland
2
McMinn County
2
Mexico, Gulf of
2
Minnesota
2
Mississippi
2
Montgomery County
2
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