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

Letter from Carl Hayden to F. R. Goodman regarding the construction of new roads.

Letter from Carl Hayden to M. J. Riordan expressing his support for Coconino County in turning over the Bright Angel Trail to the federal government.

Letter from Carl T. Hayden to Louis C. Cramton about potential prosecution of people with mining claims within park boundaries.

Letter from Carl T. Hayden to Alf Dickenson about mine locations within the park.

Letter from Carl T. Hayden to F. R. Goodman concerning the purchase of Bright Angel Trail and construction of an approach road to the park.

Typescript report, black and white, describing the mammals of Grand Canyon National Park with cover drawing of a bighorn sheep.