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Subject
- Precipitation (Meteorology)22
- United States Geological Survey Water-supply Paper20
- Rivers, creeks, streams, etc18
- Water and water supply14
- Rain and rainfall13
- Stream measurements13
- Streamflow13
- Watersheds12
- Reservoirs10
- Irrigation8
- Groundwater and aquifers7
- Hydrology6
- Lakes6
- Water levels6
- Dams5
- Wells5
- Evaporation4
- Floods4
- Runoff4
- Water power4