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Region
- American SamoaTutuila Island1
- Arkansas3
- CaliforniaAntelope Valley1
- CaliforniaMojave River Watershed1
- CaliforniaSan Bernardino County1
- Delaware3
- DelawareNew Castle County1
- High Plains (U.S.)2
- High Plains Aquifer2
- IdahoBoise Region1
- IdahoElmore County1
- IdahoMountain Home Air Force Base1
- Kansas1
- Lockport Group1
- Louisiana3
- LouisianaNew Orleans Region1
- LouisianaVernon Parish1
- Memphis (Tenn.)1
- Mississippi3
- Mississippi River Watershed1