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Region
- Africa1
- American River Watershed (Calif.)1
- Arkansas6
- Asia2
- Atlantic States1
- Baton Rouge Region (La.)1
- Black Creek Aquifer (S.C. and N.C.)2
- Burke County (Ga.)1
- Campbell County (Tenn.)1
- Carson River Watershed (Nev.)1
- ChinaWuxi1
- Claiborne County (Tenn.)1
- Connecticut River Watershed1
- Delaware3
- Earth (Planet)1
- Erie, Lake, Region1
- Europe5
- Fort Peck Indian Reservation (Mont.)1
- Georgia8
- GeorgiaAtlanta Metropolitan Area1