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Subject
- Groundwater51
- Aquifers26
- Geology, Stratigraphic23
- Stream measurements23
- Water quality19
- Groundwater flow17
- Water15
- Streamflow11
- Floods10
- Outcrops (Geology)10
- Flood forecasting9
- Volcanic ash, tuff, etc9
- Granite8
- Granite outcrops7
- National Water-Quality Laboratory (U.S.)7
- Runoff7
- Basalt outcrops6
- Water chemistry6
- Basalt5
- Gas chromatography5