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Subject
- Geology701
- Geology, Stratigraphic116
- Mines and mineral resources89
- Ore deposits32
- Geological surveys29
- Geology, Structural29
- United States Geological Survey Water-supply Paper28
- Stream measurements25
- Rivers, creeks, streams, etc24
- Streamflow24
- Paleontology23
- Water and water supply23
- Groundwater21
- Watersheds21
- Bulletin of the United States Geological Survey20
- Geological mapping15
- Description and travel14
- Sediments (Geology)14
- Petrology13
- Water-supply13