Letter from Carl Hayden to C. H. Gensler informing him of the proposed Grand Canyon National Park bill.

Letter from Carl Hayden to W. W. Bass soliciting his opinion on the proposed national park bill.

Letter from Carl Hayden to W. W. Bass informing him of the favorable opinion towards a national park bill.

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 Michael J. Riordan explaining the benefits of selling Bright Angel Trail and building an approach road.

Letter from Carl T. Hayden to J. B. Rickel concerning proposed changes to Grand Canyon National Park boundaries.

Letter from Carl T. Hayden to P. J. Moran concerning the alignment of the road to Bright Angel Trail.

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

Letter from Carl T. Hayden to J. R. Eakin regarding changes to the Grand Canyon National Park boundaries and the purchase of lands from William Randolph Hearst.

Letter from Carl Hayden to J. R. Eakin about a trip to the Grand Canyon.