Handwritten cover titled, "Nature Notes of Grand Canyon, Polyphemus Moth, Female, Found at Grand Canyon, 5 July 1928, Vol. 3 - No. 2." Cover includes a drawing of the moth.

Monthly bulletin, black and white, describing the natural history and scientific features of Grand Canyon National Park. This volume is dedicated in memoriam to Glen E. Sturdevant, park naturalist, and Fred Johnson, park ranger, who drowned while collecting specimens in the park.

Monthly bulletin, black and white, describing the natural history and scientific features of Grand Canyon National Park with cover drawing of fern bush.

Typescript report, black and white, describing the birds of Grand Canyon National Park with cover drawing of a bald eagle.

Typescript report, black and white, describing the mammals of Grand Canyon National Park with cover drawing of a bighorn sheep.

Publication detailing the natural history of the Grand Canyon. Vol.9, No.9. Circa 1926-1934.

Press release on the increase in wildlife in the Grand Canyon including mountain sheep, deer, and the Abert Squirrel.

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

Letter from unknown author (possibly Jack) to Jesse L. Boyce regarding his complaint concerning the TNT located in the Grand Canyon. Enclosed is Superintendent Crosby's report in which he states that the current housing location of the TNT is not a threat to anyone.

Letter from W. W. Crosby to the Director of the National Park Service defending his placement of the dynamite near Grand Canyon Village. He states there is between 16-20 tons of dynamite.