Explorations and surveys for a rail road route from the Mississippi River to the Pacific Ocean, War Department : Routes near the 47th and 49th parallels ; profiles from explorations and surveys made under the direction of the Hon. Jefferson Davis, Secretary of War.
Description: Map shows altitude, grade, and distances of potential railroad route across Washington Territory [modern-day Idaho, Montana, and Washington]; military posts and camps, river crossings, and mountain passes. Relief shown by profile and spot heights. Scale [1:1,200,000].
Creator: Stevens, Isaac Ingalls, 1818-1862
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