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Subject
- Groundwater27
- Aquifers21
- Water quality6
- Hydrogeology4
- Coal mines and mining2
- National Atmospheric Deposition Program (U.S.)2
- Saline waters2
- Acid deposition1
- Coalfields1
- Hazardous waste sites1
- Hydrogen-ion concentration1
- Hydrology1
- Meteorological stations1
- Potentiometry1
- Precipitation (Meteorology)1
- Precipitation scavenging1
- Roads1
- Saline water barriers1
- Saltwater encroachment1
- Sanitary landfills1