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Subject
- Hydrology128
- United States Geological Survey Water-supply Paper98
- Rivers, creeks, streams, etc85
- Watersheds69
- Water and water supply62
- Groundwater and aquifers60
- Stream measurements53
- Water levels46
- Wells45
- Geology43
- Streamflow39
- Geological surveys37
- Hydrographic surveying36
- Irrigation32
- Precipitation (Meteorology)28
- Artesian wells27
- Runoff23
- Rain and rainfall22
- Reservoirs20
- Water power16