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Subject
- Groundwater26
- Nutrient pollution of water20
- Water quality16
- Nitrates13
- Pesticides11
- Water10
- Groundwater flow9
- Suspended sediments8
- Aquifers4
- Hydrogeology4
- Nonpoint source pollution4
- Volatile organic compounds4
- Freshwater algae2
- Hazardous wastes2
- Organochlorine compounds2
- Water consumption2
- Water withdrawals2
- Water-supply2
- Agricultural chemicals1
- Agricultural pollution1