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Subject
- Geology[remove]104
- Cartes15
- Géologie15
- Anthracite coal11
- Coal9
- Geology, Stratigraphic6
- Petroleum5
- Natural gas4
- Administrative and political divisions1
- Anthracite1
- Bituminous coal1
- Bituminous coal mines and mining1
- Cities and towns1
- Climate1
- Climatology1
- Coalfields1
- Geological surveys1
- Mines and mineral resources1
- Mississippian Geologic Period1
- Oil fields1
