Letter from Carl Hayden to George W. P. Hunt outlining the proposed national park boundaries and the cost of a township if the state of Arizona decided to acquire one on the rim of the Grand Canyon.

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

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."

Letter from A. F. Potter to John H. Page referring his request to build a railway to the District Forester at Albuquerque, New Mexico.

Letter from John H. Page regarding his right to build a railway between Grand Canyon Station and the Canyon Copper Company's mines and hotel.

Letter from Gifford Pinchot to John H. Page denying his request to build a railway on the rim of the Grand Canyon for the Canyon Copper Company.

Letter from John H. Page to Carl T. Hayden regarding his company's rights to build a railway if they choose to.

Letter from Henry Graves to Carl T. Hayden regarding the land ownership and grazing rights of the Havasupai.

Letter from Harold Greene to Carl Hayden regarding the proposed boundaries for the national park bill.

Letter from Carl Hayden to L. S. Williams informing the Saginaw and Manistee Lumber Company that a bill extending the timber cutting rights in the Canyon did not pass in Congress.