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Subject
- Geology503
- Geology, Stratigraphic102
- Geology, Structural99
- Census districts62
- Mines and mineral resources58
- Submarine topography41
- Aquifers34
- Ocean bottom34
- Atlases31
- Groundwater30
- Hydrogeology28
- Marine sediments24
- Faults (Geology)23
- Water table23
- Geochemical prospecting22
- World maps22
- Historical geography20
- Physical geography18
- Land use17
- Roads17