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Region
- OregonUpper Klamath Lake2
- ArizonaBlack Mesa (Navajo County and Apache County)1
- Arkansas1
- Bushy Park Reservoir (S.C.)1
- CaliforniaLong Valley Caldera1
- FloridaTampa Bay Region1
- Kentucky1
- Long Valley Caldera (Calif.)1
- MontanaFort Belknap Indian Reservation1
- MontanaSweet Grass Hills1
- New MexicoSan Juan County1
- San Juan River (Colo.-Utah)1
- South CarolinaCharleston Region1
- TexasLackland Air Force Base1