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Subject
- Mines and mineral resources51
- Groundwater46
- Geology, Stratigraphic43
- Roads41
- Aquifers30
- Geology27
- Great Britain. Colonial Office21
- Census districts20
- Ore deposits19
- Metropolitan areas15
- Marine sediments13
- Faults (Geology)12
- Geochemical prospecting11
- Geology, Structural11
- Indigenous peoples11
- Atlases10
- Landslides10
- Outcrops (Geology)10
- Railroads9
- Volcanic ash, tuff, etc9