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- Geology, Stratigraphic68
- Geology55
- Paleontology15
- Paleozoic Geologic Period13
- Coal5
- Geology, Structural3
- Mines and mineral resources3
- Petrology3
- Analysis2
- Bituminous coal2
- Breccia2
- Faults (Geology)2
- Fishes, Fossil2
- Groundwater2
- Géologie stratigraphique2
- Mesozoic Geologic Period2
- Paleobotany2
- Petroleum2
- Properties2
- Pyrolysis2