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- Maryland2
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- ArizonaSalt River Indian Reservation1
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- Columbia Plateau1
- DelawareNew Castle County1
- High Plains (U.S.)1
- High Plains Aquifer1
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- LouisianaBarataria Bay Watershed1
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- MontanaFort Peck Indian Reservation1
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- Red River Region (Tex. and La.)1
- Snake River Plain (Idaho and Or.)1
- Texas, West1
- WyomingCampbell County1
- WyomingGillette1