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Subject
- Geology130
- Petroleum[remove]130
- Oil well logging35
- Natural gas15
- Oil fields8
- Amerada Petroleum Corporation5
- Gas, Natural5
- Geology, Stratigraphic5
- Petroleum industry and trade5
- American Association of Petroleum Geologists4
- Oil wells4
- Prospecting4
- Calvert Drilling, Inc3
- Cardinal Drilling Company3
- Geology, Structural3
- History3
- Hunt Oil Company3
- Petroleum reserves3
- Addresses, essays, lectures2
- Congresses2