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Region
- ArizonaVerde River1
- ArizonaVerde River Watershed1
- Arkansas1
- Des Plaines River (Wis. and Ill.)1
- Idaho1
- IdahoIdaho National Laboratory Region1
- IdahoSnake River Plain Aquifer1
- Illinois1
- Illinois River (Ill.)1
- Mississippi1
- Montana1
- Ohio1
- PennsylvaniaMarsh Creek (Tioga County)1
- Snake River Plain (Idaho and Or.)1
- Snake River Plain Aquifer (Idaho)1
- South Carolina1
- Wyoming1