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Subject
- Geology22
- Groundwater13
- Mines and mineral resources6
- Geology, Stratigraphic5
- Water quality5
- Coal mines and mining4
- Hydrogeology4
- Hydrology4
- Mineral industries3
- Water-supply3
- Coal2
- Strip mining2
- Aerial photography in geology1
- Barite1
- Conterminous United States Mineral Assessment Program1
- Earthquake prediction1
- Folds (Geology)1
- Formations (Geology)1
- Geochemistry1
- Geology, Economic1