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Subject
- Groundwater27
- Nutrient pollution of water23
- Water quality17
- Nitrates13
- Pesticides11
- Suspended sediments10
- Water10
- Groundwater flow9
- Volatile organic compounds5
- Aquifers4
- Hydrogeology4
- Nonpoint source pollution4
- Benthic animals3
- Hazardous wastes3
- Organochlorine compounds3
- Freshwater algae2
- Streamflow2
- Water consumption2
- Water withdrawals2
- Water-supply2