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Subject
- Administrative and political divisions7
- Railroads5
- Real property5
- Copper mines and mining4
- Geology3
- Nautical charts3
- History2
- Landowners2
- Mines and mineral resources2
- Navigation2
- Roads2
- Buildings1
- Buildings, structures, etc1
- Coasts1
- Colorado1
- Discoveries in geography1
- Discovery and exploration1
- Gold discoveries1
- Gold mines and mining1
- History, Military1
