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Subject
- Geology94
- Geology, Stratigraphic18
- Mines and mineral resources13
- Groundwater8
- Geology, Structural7
- Uranium ores6
- Ore deposits5
- Water-supply5
- Paleontology4
- Copper mines and mining3
- Erosion3
- Geological mapping3
- Guidebooks3
- Petroleum3
- Sediments (Geology)3
- Basins (Geology)2
- Bibliography2
- Breccia2
- Geochemistry2
- Geological Survey (U.S.)2