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Region
- Chesapeake Bay Region (Md. and Va.)3
- Alabama2
- Florida2
- Floridan Aquifer2
- Mississippi2
- Delaware River Watershed (N.Y.-Del. and N.J.)1
- High Plains Aquifer1
- Hudson River Watershed1
- Kansas1
- Magothy Aquifer1
- Maryland1
- Powder River Watershed (Wyo. and Mont.)1
- Suwannee River (Ga. and Fla.)1
- Suwannee River Watershed (Ga. and Fla.)1