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Subject
- Railroads20
- Geology13
- Real property13
- Roads8
- Geology, Structural4
- Residential real estate4
- Gas wells3
- Oil wells3
- Real estate development3
- Federal aid to transportation2
- Landowners2
- Maps2
- Mines and mineral resources2
- Nautical charts2
- Administrative and political divisions1
- Discoveries in geography1
- Discovery and exploration1
- Ethnology1
- Fire risk assessment1
- Forest reserves1
