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Subject
- Geology379
- Geology, Stratigraphic21
- Geology, Structural21
- Hydrogeology14
- Aquifers11
- Mines and mineral resources9
- Geochemical prospecting8
- Groundwater7
- Water table6
- Ocean bottom4
- Coal3
- Gold ores3
- Groundwater flow3
- Petroleum3
- Planets3
- Volcanic ash, tuff, etc3
- Census districts2
- Faults (Geology)2
- Geochemistry2
- Geological cross sections2