Letter from Arno B. Cammerer to Carl Hayden regarding the storage of dynamite in Shoski Canyon.

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

Letter from Carl T. Hayden to C. H. Gensler, Havasupai Indian Reservation, regarding Hualapai and Cataract Canyons geography.

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

Letter from Arno B. Cammerer to Carl Hayden reiterating the safe nature of the dynamite storage.

Letter from Arno B. Cammerer to Carl Hayden supporting Superintendent Crosby's stance that there is no need to remove the dynamite stored near Grand Canyon Village.

Letter from Carl Hayden to Arno B. Cammerer on behalf of Jesse L. Boyce's complaint. Hayden states that Boyce believes Crosby's report to be inaccurate and an underestimation of the danger of the stored explosives.

Letter from the Acting Director of the National Park to Carl Hayden assuring him that Superintendent Crosby had removed the dynamite nearby Grand Canyon Village and placed it in a safe location on the South Rim.

Letter from Carl Hayden to L. L. Ferrall on the favorable conditions for creating a national park and the prospect of the United States entering WW I.

Letter from W. W. Bass to Carl Hayden requesting the boundaries of the park be reconsidered as a large portion of the land is suitable for mining and farming.