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- Groundwater25
- Aquifers16
- Water8
- Hydrogeology5
- Water-supply4
- Groundwater flow3
- Nutrient pollution of water3
- Pesticides3
- Water quality3
- Drinking water2
- Geology2
- Polychlorinated biphenyls2
- Stream measurements2
- Agricultural chemicals1
- Electric power production1
- Industrial water supply1
- Land use1
- Nitrates1
- Nitrogen1
- Saltwater encroachment1