Letter from Carl Hayden to Hugh E. Campbell with an enclosed outline map of the proposed boundaries of Grand Canyon National Park.
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Senator Carl T. Hayden Papers (1851-1979), Grand Canyon National Park, Establishment of, correspondence, bills, reports, clippings, 1910-1919. MSS 1. Greater Arizona Collection. ASU Library, Arizona State University, Tempe, AZ. http://azarchivesonline.org/xtf/view?docId=ead/asu/hayden.xml