From the valley of the Mud Lakes to the Pacific Ocean.

Scale 1:760,320.
At head of title: Route near the 41st Parallel. Map no. 4.
Relief shown by hachures.
From U.S. War Department, Explorations and Surveys for a Railroad Route from the Mississippi River to the Pacific Ocean. Topographical Maps ... to Illustrate the Various Reports ... (Washington, 1859)
LC Railroad maps, 168
Description derived from published bibliography.
Available also through the Library of Congress Web site as a raster image.