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- Geology85
- Petroleum77
- Geology, Stratigraphic16
- Tertiary Geologic Period7
- Cogeneration of electric power and heat5
- Cretaceous Geologic Period5
- Fossil fuels5
- Geochemistry5
- Oil well logging5
- Petrology5
- Prospecting5
- Stratigraphic correlation5
- Geophysics4
- Hydrocarbon reservoirs4
- Hydrocarbons4
- Analysis3
- Basins (Geology)3
- Mineralogy3
- Natural gas3
- Oil reservoir engineering3