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Subject
- Copper mines and mining19
- History8
- Community life3
- Copper industry and trade3
- Economic conditions3
- Geology3
- History, Local3
- Mining camps3
- Social aspects3
- Social conditions3
- British Americans1
- Calumet and Hecla Mining Company1
- Cornish1
- Description and travel1
- Frontier and pioneer life1
- Historic sites1
- Hobart, Henry, 1841-19201
- Industrial sites1
- Industries1
- Lake Superior Copper Company1