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Subject
- Groundwater44
- Roads38
- Aquifers30
- Geology, Stratigraphic29
- Great Britain. Colonial Office21
- Ore deposits14
- Mines and mineral resources12
- Geology11
- Outcrops (Geology)10
- Census districts9
- Faults (Geology)9
- Landslides9
- Metropolitan areas9
- Volcanic ash, tuff, etc9
- Granite8
- Harbors8
- Indigenous peoples8
- Motor vehicles8
- Granite outcrops7
- Railroads7