Map of the copper range in T. 51 R. 37 and adjacent parts, Ontonagon County, Michigan showing the location of the mines and principal beds.
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Map of the copper range in T. 51 R. 37 and adjacent parts, Ontonagon County, Michigan showing the location of the mines and principal beds., map, 1907; Houghton, Mich. (texashistory.unt.edu/ark:/67531/metapth193486/: accessed October 20, 2018), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; crediting University of Texas at Arlington Library.