Letter of introduction for Dwight B. Heard on the arrival of National Park Service Director Stephen T. Mather to Phoenix. Mather's visit includes trips to Roosevelt Dam and Tumacácori.
Senator Carl T. Hayden Papers (1851-1979), National Park Service- grazing and highway construction in Grand Canyon Park. Also, correspondence Papago National Monument and other national parks in Arizona, 1922-1923. 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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