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- Geology8
- Geomagnetism3
- Magnetic declination3
- Mines and mineral resources3
- Real property3
- Triangulation3
- Gold discoveries2
- Gold mines and mining2
- Land grants2
- Nautical charts2
- Roads2
- Surveys2
- Bicycle trails1
- Copper River Region (Alaska)1
- Discovery and exploration1
- Groundwater1
- Harbors1
- Las Animas County (Colo.)1
- Mining districts1
- Public lands1
