Letter from J. E. Gavin to Jesse L. Boyce regarding the TNT storage in the Grand Canyon. Gavin states that although acting director Arno B. Cammerer is confident in Superintendent Crosby's report concerning the legitimacy of the storage, he will continue to investigate the matter to ensure public safety.
- Letter From J. E. Gavin, Secretary, to Jesse L. Boyce
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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