Letter from Stephen T. Mather to Carl Hayden regarding amendments to the national park bill including Mather's approval of the Secretary of the Interior granting railroads rights of way.
- Letter From Stephen Mather, U.S. National Park Service to Carl Hayden
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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