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Subject
- Geology[remove]271
- Prospecting178
- Petroleum130
- Geochemical prospecting50
- Natural gas45
- Mines and mineral resources37
- Geophysical methods35
- Seismic prospecting33
- Geological surveys13
- Petroleum engineering12
- Ore deposits11
- Radioactive prospecting11
- Uranium ores11
- Geology, Stratigraphic9
- Coal8
- Mineralogical research8
- Bulletin of the United States Geological Survey7
- Geochemistry7
- Geophysics7
- Oil reservoir engineering7