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Subject
- Groundwater[remove]416
- Aquifers201
- Water table95
- Hydrogeology30
- Water quality23
- Water-supply21
- Hydrology11
- Groundwater flow10
- Water levels10
- Wells8
- Water chemistry7
- Geology6
- Saltwater encroachment6
- Equus Beds Ground-water Recharge Demonstration Project (U.S.)5
- Dioxane3
- Hazardous waste sites3
- Nitrates3
- Tucson International Airport3
- Water3
- Water resources development3