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

Letter from Jesse L. Boyce to Carl Hayden stating there is 30 tons of dynamite located in the Grand Canyon near tourist sites.

Letter from Jesse L. Boyce to Carl Hayden stating that the Director of the National Park Service will order Colonel Crosby to remove the dynamite from the park.

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 Stephen Mather to Carl T. Hayden regarding automobile regulations within Grand Canyon National Park.

Letter from Stephen T. Mather to Carl T. Hayden advocating for a reduction in automobile fees for the South Rim entrance.

Letter from Stephen T. Mather to Carl T. Hayden regarding a negative newspaper article about the National Park Service and Stephen Mather.

Letter from Stephen T. Mather to Carl T. Hayden thanking Hayden for his advice about visiting Arizona.

Letter from Carl Hayden to Stephen Mather regarding the sale of Bass properties.

Letter from Carl Hayden to Stephen Mather requesting that congress pay W. W. Bass the sum of twenty-five thousand dollars for his properties.