Letter from Stephen Mather, National Park Service to Carl Hayden on payment to W. W. Bass.

Letter from Carl Hayden to Stephen Mather regarding Coconino County's willingness to dispose of Bright Angel Trail as long as the funds acquired would go to building a road between Old Trails Highway at Maine to the Grand Canyon.

Letter from the Director of the National Park Service, Stephen T. Mather, to Jesse L. Boyce informing him that immediate action is being taken to remove the TNT from 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.

Letter from Stephen T. Mather to Carl Hayden regarding amendments to the national park bill including Mather's approval of the Secretary of the Interior granting railroads rights of way.

Letter from Carl Hayden to Stephen T. Mather regarding certain amendments to the national park bill. Rights regarding the Havasupai Tribe are mentioned.

Black and white print of the Grand Canyon with a typescript annotation, "July 17, 1914. Grand Canyon Arizona. On the left side you can see some of the mules taking people down the Bright Angel Trail to the bottom of the Canyon."

Letter from Stephen T. Mather to Carl Hayden with markup of bill S 390 for the proposed National Park.

Letter to Carl T. Hayden regarding a water-power bill in effect for the Grand Canyon.

Letter from Bernie Zachau to Carl Hayden regarding water power in the Grand Canyon.