Letter from George Otis Smith to Carl Hayden regarding mining rights in the Grand Canyon.

Letter from Carl Hayden to George Otis Smith asking his advice regarding the mining of asbestos deposits in the Grand Canyon.

Letter from George Otis Smith, U.S. Geological Survey to Carl Hayden regarding asbestos mining prospects in the Grand Canyon.

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 of more than 40 people near a canyon overlook with handwritten annotation, "5-06-03 Looking Toward Canon [sic] From Hotel."

Black and white mounted print of people looking up at President Theodore Roosevelt speaking on a balcony, with handwritten annotation, "Pres. R. Speaking From Hotel Veranda."

Black and white mounted print of people on horseback riding away from the camera; railroad tracks are visible in the foreground. Handwritten annotation "President Roosevelt and party setting out to see Canon."

Black and white mounted print of Theodore Roosevelt riding a horse, blurry from motion, handwritten annotation, "5-6-03 President Roosevelt."

Black and white mounted print with handwritten annotation, " 1 Bright Angel Hotel at Grand Canyon 5-6-03; 1 Mrs. Lemke, 2 Ealinor Smith, 3 Mrs. Smith, 4 Anna O'Neil, 5 Judge Kent, 6 Barry Smith, 7 Cath O'Neil, 8 Capt Crenshaw."