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Subject
- Water quality64
- Groundwater51
- Water-supply37
- Water resources development36
- Irrigation33
- Reclamation of land32
- Water30
- Streamflow29
- Stream measurements27
- Groundwater flow24
- Irrigation laws20
- Irrigation water20
- Hydrogeology19
- River sediments14
- United States14
- Selenium13
- Aquifers12
- Water table11
- Reservoirs10
- United States. Bureau of Reclamation10