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Subject
- Precipitation (Meteorology)35
- Rain and rainfall22
- Rivers, creeks, streams, etc22
- Water and water supply21
- United States Geological Survey Water-supply Paper20
- Climate19
- Meteorology and weather forecasting17
- Irrigation15
- Reservoirs14
- Stream measurements13
- Streamflow13
- Discovery and exploration12
- Surveying12
- Watersheds12
- Geology11
- Meteorology11
- Financial statements10
- Astronomy9
- Wells9
- Agriculture8