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Subject
- Geology7
- Roads5
- Cartes3
- Coal mines and mining3
- Cities and towns2
- Counties2
- Mines and mineral resources2
- Railroads2
- Administrative and political divisions1
- Aquifers1
- Artificial groundwater recharge1
- Canals1
- Coal1
- Coal trade1
- Coal-fired power plants1
- Design and construction1
- Gas fields1
- Gas industry1
- Gaz1
- Geology, Stratigraphic1
