Letter from George Otis Smith, U.S. Geological Survey to Carl Hayden regarding asbestos mining prospects in the Grand Canyon.
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- Smith, George Otis (Author)
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Senator Carl T. Hayden Papers (1851-1979), Grand Canyon National Park, correspondence, maps, data, bills re: establishment as National Park, 1917-1918. MSS 1. Greater Arizona Collection. ASU Library, Arizona State University, Tempe, AZ. http://azarchivesonline.org/xtf/view?docId=ead/asu/hayden.xml