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Subject
- Real property11
- Railroads9
- Nautical charts5
- Administrative and political divisions4
- Discovery and exploration3
- Landowners3
- Buildings2
- Explorations and surveys2
- Gold mines and mining2
- Navigation2
- Pacific railroads2
- Cables, Submarine1
- Canals1
- Cities and towns1
- Coal mines and mining1
- Coalfields1
- Fire risk assessment1
- Gadsden Purchase1
- Geological cross sections1
- Geology1
