Investigation of West Belt Copper-Zinc Mines, El Dorado, Amador, Calaveras, and Mariposa Counties, California
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Investigation of West Belt Copper-Zinc Mines, El Dorado, Amador, Calaveras, and Mariposa Counties, California, report, February 1951; [Washington D.C.]. (https://digital.library.unt.edu/ark:/67531/metadc38555/: accessed June 10, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.