Subject: Copper mines and mining / Spatial Coverage: Houghton County - Yale University Library GeoBlacklight Search Results

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1. Map of property of the Globe Copper Company and mines in the Portage Lake District

1870. 2011-02-08T18:57:34Z. 2019-03-15T17:31:07Z. J.O. Seymour & Co., cartographer. J.O. Seymour & Co. English. Public. Houghton County (Mich.), Michigan, and Houghton County.

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1. Map of property of the Globe Copper Company and mines in the Portage Lake District

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