Relief shown by hachures and spot heights., "Compiled ... in the Office of Pacific R.R. Surveys, War Dep. under the direction of Bvt. Maj. W...., "This map is a correct representation of our information up to May 1, 1857.", Engraved by Selmar Siebert., Shows Indian tribal locations, military posts, routes and dates of expeditions and surveys., From the War Dept.'s Reports of explorations and surveys to ascertain the most practicable and ec..., Includes "Note" and "Authorities."