From the Rio Grande to the Pacific Ocean : from explorations and surveys /

Scale 1:950,400.
At head of title: Route near the 35th Parallel. Map no. 2.
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, 153
Description derived from published bibliography.
Insets: Sketch of Aztec Pass. Drawn by C. Mahon. From a sketch by A. H. Campbell, Civil Engineer. 12 x 17 cm.--Sketch of Campbell's Pass from Agua Azul to Salt Spring. Drawn by C. Mahon. 13 x 32 cm.
Available also through the Library of Congress Web site as a raster image.