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- Hydrogeology41
- Groundwater28
- Groundwater flow24
- Aquifers18
- Water quality14
- Hydrology8
- Hydraulics6
- Water levels5
- Agricultural chemicals2
- Agricultural pollution2
- Borings2
- Lakes2
- Water2
- Water chemistry2
- Water resources development2
- Water table2
- Wells2
- Acid deposition1
- Acid mine drainage1
- Aeronautical Systems Center (U.S.)1