Letter from the Director of the National Park Service, Stephen T. Mather, to Jesse L. Boyce informing him that immediate action is being taken to remove the TNT from the Grand Canyon.
- Letter From Stephen T. Mather, U.S. National Park Service 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