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Subject
- Hydrology73
- Water-supply19
- Rivers, creeks, streams, etc12
- Watersheds12
- Groundwater flow10
- Water and water supply10
- Geology9
- Groundwater9
- Wells9
- Irrigation8
- Radioactive waste disposal in the ground8
- Water levels8
- Hydrologic models7
- United States Geological Survey Water-supply Paper7
- Water balance (Hydrology)7
- Hydrographic surveying6
- Mathematical models6
- Reservoirs6
- Geological surveys5
- Stream measurements5