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Subject
- Groundwater[remove]4,514
- Aquifers661
- Water-supply625
- Water quality602
- Hydrogeology455
- Groundwater flow334
- Water301
- Water table238
- Geology187
- Hydrology164
- Drinking water145
- Water resources development145
- Water quality management135
- Nitrates111
- Water levels110
- Pesticides100
- Wells92
- Water chemistry78
- Arsenic68
- Geology, Stratigraphic61