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- Hydrogeology227
- Groundwater216
- Water quality126
- Hydrology116
- Groundwater flow112
- Aquifers101
- Water table23
- Water-supply22
- Water20
- Streamflow15
- Sanitary landfills14
- Water levels12
- Hazardous waste sites11
- Stream measurements11
- Wells11
- Coal mines and mining10
- Water chemistry10
- Hydraulics9
- Lakes8
- Water resources development8