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.

Black and white print with typescript annotation, "Close up view of Vulcan Throne, Grand Canyon, 89 miles below Bright Angel Creek." Handwritten annotation, "Exhibit IV." Circa 1920-1929.

Black and white print with typescript annotation, "Upstream view of the canyon of Colorado River at the bridge site near Lees Ferry, Arizona." Handwritten annotation, "Exhibit I." Circa 1920-1929.

Black and white print of man overlooking the canyon, with handwritten annotations and arrows identifying trail sites, " Mi. 38", "Dam Site" and "Mi. 37." Circa 1920-1929.