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- Geology[remove]210
- Petroleum210
- Natural gas30
- Geology, Stratigraphic20
- Oil fields17
- Prospecting9
- Petroleum engineering7
- Géologie6
- Pétrole6
- Mines and mineral resources5
- Oil reservoir engineering5
- Oil well drilling5
- Petroleum in submerged lands5
- Petroleum industry and trade5
- Basins (Geology)4
- Coal4
- Environmental aspects4
- Mathematical models4
- Oil sands4
- Data processing3