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Region
- Delaware3
- New Jersey3
- Arkansas2
- New JerseyOcean County2
- New Mexico2
- Rio Grande Valley2
- Santa Fe Group2
- TexasEdwards Plateau Region2
- TexasTrinity River Watershed2
- High Plains Aquifer1
- Kansas1
- Louisiana1
- LouisianaVernon Parish1
- Mississippi1
- Mississippi River Watershed1
- Monument Valley (Ariz. and Utah)1
- PennsylvaniaChester County1
- PennsylvaniaPhiladelphia Region1
- Puerto RicoDemajagua River Watershed1
- Puerto RicoEspíritu Santo River Watershed1