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.
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
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