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USGSPrincipalAquifers (MapServer)
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Legend (GeoHub/USGSPrincipalAquifers)
Principal Aquifers (0)
Colorado Plateaus aquifers
High Plains aquifer
Lower Cretaceous aquifers
Lower Tertiary aquifers
Northern Rocky Mountains Intermontane Basins aquifer system
Other rocks
Pacific Northwest basaltic-rock aquifers
Pacific Northwest basin-fill aquifers
Paleozoic aquifers
Upper Cretaceous aquifers
Upper Tertiary aquifers