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 - Dellenbaugh, Frederick Samuel, 1853-1935 (Project Gutenberg, 2007)
Electronic text
Keywords: Grand Canyon (Ariz.); Powell, John Wesley, 1834-1902; Colorado River (Colo.-Mexico); United States -- Discovery and exploration