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 from W. W. Bass to Carl Hayden regarding the right to his property.

Letter from Carl T. Hayden to C. H. Gensler, Havasupai Indian Reservation, regarding Hualapai and Cataract Canyons geography.

Letter from C. H. Gensler, Havasupai Agency to Carl Hayden regarding boundary lines.

Letter from Alexander Vogelsang to Homer P. Snyder regarding land allocation for the Havasupai Tribe.

Letter from Carl Hayden to W. W. Bass on the recent amendments made to the national park bill.

Letter from W. W. Bass to Carl Hayden arguing for a delay in the national park bill proceedings.

Letter to W. W. Bass from Carl Hayden's secretary informing him of a vote on the national park bill will not be held until December.