Preliminary map no. 2, (transcript of plane table sheets) of ...
Relief shown by hachures. Note: green = irrigable land; blue = timber land. Above title: Department of the Interior, U. S. Geological and Geographical survey of the territories, Second Division. J. W. Powell, geologist in charge. Available also through the Library of Congress Web site as a raster image.
Geological and Geographical Survey of the Territories (U.S.) - Powell, John Wesley - Thompson, A. H. (Almon Harris)