Letter from attorney Thomas J. Croff to Carl Hayden informing him of the Atchison, Topeka, and Santa Fe railroad company's ownership of land inside the proposed national park boundaries.

Letter from Carl Hayden to C. T. Woolfolk thanking him for his support on the proposed bill. Hayden writes that the bill will not be introduced into the current session of Congress as any new legislation would be impossible to pass, but he is optimistic over the bill's future.

Letter from Ralph H. Cameron to Carl Hayden requesting a delay on the introduction of the Grand Canyon bill until he can meet with himself and Senator Ashurst in Washington.

Black and white print of automobile parked at an overlook. Automobile displays the sign, "Press Car Arizona Republican."

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.

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

Black and white print of people riding mules down a trail. Circa 1940-1949.