United States Geological Survey

Arizona--Grand Canyon; Bureau of Ethnology; Colorado Canon (Grand Canyon); Hayden, Ferdinand Vandeveer; King, Clarence; Powell, John Wesley; United States Geological and Geographical Survey of the Rocky Mountain Region; Wesleyan University, Bloomington, Indiana; Wheeler, Lieut.

"United States Geological Survey.", Rare Books, Special Collections, and Preservation, River Campus Libraries, University of Rochester, Ward Project, accessed July 2nd, 2020, https://wardproject.org/items/show/13201