Frederick Samuel Dellenbaugh
A Canyon Voyage The Narrative of the Second Powell Expedition down the Green-Colorado River from Wyoming, and the Explorations on Land, in the Years 1871 and 1872
Breaking the Wilderness; The Story of the Conquest of the far West, From the Wanderings of Cabeza de Vaca, to the First Descent of the Colorado by ... Account of the Exploits of Trappers