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Region
- United States5
- Appalachian Basin2
- Illinois Basin2
- Michigan Basin (Mich. and Ont.)2
- Bog Hot Valley (Nev.)1
- CaliforniaHayward Fault1
- Floridan Aquifer1
- Hayward Fault (Calif.)1
- Illinois1
- Michigan1
- NevadaChurchill County1
- NevadaHumboldt County1
- OregonTualatin Mountains1
- Pueblo Valley (Or. and Nev.)1
- Southern States1
- Steens Fault Zone1
- Tualatin Mountains (Or.)1