Mineral survey no. 20783, Colorado Land District : field notes of the survey of the mining claim of American Smelting and Refining Company / by J.M. Kleff. 1954 Jan. 26.
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Kleff, J. M.
http://n2t.net/ark:/99166/w6gh9hv5 (person)
American Smelting and Refining Company
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