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Subject
- Geology57
- Real property23
- Nautical charts22
- Navigation21
- Harbors13
- Copper mines and mining10
- Geology, Stratigraphic10
- Geomagnetism10
- Landowners10
- Surveys10
- MI9
- Mines and mineral resources8
- Railroads8
- Forest management7
- Forest reserves6
- Geology, Structural6
- Roads6
- Administrative and political divisions3
- Cartes3
- Real estate development3
