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Region
- Alabama10
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- Colorado4
- Columbia Plateau4
- Utah3
- Arkansas2
- Colorado River Watershed (Colo.-Mexico)2
- Connecticut River Watershed2
- Florida2
- Gulf Coast (U.S.)2
- MassachusettsPlymouth County2
- Merrimack River Watershed (N.H. and Mass.)2
- Mississippi2
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- Ohio2
- Oregon2
- Rhode IslandKent County2
- South CarolinaSavannah River Site Region2
- TexasUvalde County2