Letter from Arno B. Cammerer to Carl Hayden on the investigation by Superintendent Crosby regarding the TNT stored in the Grand Canyon.
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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