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 [electronic resource] /
Frederick Samuel Dellenbaugh
- Project Gutenberg, 2007
- Project Gutenberg 20667 .
Public domain in the USA.
Electronic text
Grand Canyon (Ariz.) Powell, John Wesley, 1834-1902 Colorado River (Colo.-Mexico) United States -- Discovery and exploration