Letter from W. W. Bass to Carl Hayden requesting the boundaries of the park be reconsidered as a large portion of the land is suitable for mining and farming.
Letter from John Page to Carl Hayden concerning the future of property ownership within the proposed boundaries of the national park.
Letter from W. W. Bass to Carl Hayden concerning the mining of asbestos in the Grand Canyon.
Letter from W. W. Bass to Carl Hayden urging him to visit the Grand Canyon in order to see what effect the National Park bill would have on the farmers and miners of the Grand Canyon. Bass urges Hayden to "correct a threatening evil" and the monopoly such a proposal would give to the Santa Fe Railway line, includes newspaper clipping.
Typescript report, black and white, describing the birds of Grand Canyon National Park with cover drawing of a bald eagle.
Letter from George Otis Smith, U.S. Geological Survey to Carl Hayden regarding asbestos mining prospects 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 to Carl Hayden regarding mining rights in the Grand Canyon.
Letter from A. F. Potter to Carl T. Hayden describing John H. Page's request to build a railway for the Canyon Copper Company as "impractical."