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

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

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 W. W. Bass to Harry Welch protesting the proposed national park bill.

Letter from Harry Welch to Carl Hayden enclosing W. W. Bass' letter of protest against the proposed national park bill.

Letter from L. B. Williams to Carl Hayden regarding W. W. Bass' resistance to the park bill.

Amendments to the bill establishing the Grand Canyon a National Monument. Circa 1908.

Letter from Miner Tillotson to Carl Hayden in regards to a request for two small blue spruce trees from the North Rim.

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