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- Geology19
- Petroleum19
- Natural gas5
- Oil and gas leases3
- Stratigraphic correlation3
- Environmental aspects2
- Natural gas reserves2
- Oil well drilling2
- Petroleum reserves2
- Borings1
- Canada. Institute of Sedimentary and Petroleum Geology1
- Carbon1
- Gases1
- Geological surveys1
- Geology, Stratigraphic1
- Geophysical methods1
- Groundwater1
- Hazardous geographic environments1
- Isotopes1
- Oil fields1