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Subject
- Railroads31
- Geology28
- Real property19
- Groundwater12
- Aquifers11
- Description and travel11
- Roads11
- Triangulation7
- Hydrogeology6
- Railroad land grants6
- Landowners5
- Water table5
- Administrative and political divisions4
- Cities and towns4
- Geology, Stratigraphic3
- Gold discoveries3
- Gold mines and mining3
- Mines and mineral resources3
- Oil fields3
- Oil wells3
