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Region
- PennsylvaniaChester County7
- Arkansas2
- Mississippi2
- New Mexico2
- Rio Grande Valley2
- Santa Fe Group2
- American SamoaTutuila Island1
- CaliforniaAntelope Valley1
- CaliforniaMojave River Watershed1
- CaliforniaSan Bernardino County1
- Delaware1
- DelawareNew Castle County1
- High Plains (U.S.)1
- High Plains Aquifer1
- IdahoElmore County1
- IdahoMountain Home Air Force Base1
- Kansas1
- Louisiana1
- LouisianaNew Orleans Region1
- Mississippi River Watershed1