Scale 1:1,200,000. Relief shown by hachures. At head of title: Route near the 47th and 49th Parallels. Map no. 1. "Drawn by John Lambert. Topographer of the exploration." 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, 154 Description derived from published ...
Lambert, John - Davis, Jefferson - Stevens, Isaac Ingalls - Siebert, Selmar - United States. War Department
"The large lines on the above map show the location of the Chicago & North-Western Railway, and its branches, the small lines its connections." Shows relief by hachures, drainage, cities and towns, townships, counties, and railroads.
Rand McNally and Company - Chicago and North Western Railway Company