(Montana - Idaho) Milk R. to the Crossing of the Columbia R. From Explorations & Surveys made under the Direction of the Hon. Jefferson Davis, Secretary of War by Issac I. Stevens, Gov. of Washington Territory, Washington, US Army, Pacific Rail Road Survey
This large map was issued with the reports of the Rail Road Survey. It shows the region from Fort Benton to the Columbia River in excellent detail with the rivers and mountains and occasional posts. Numerous routes are shown as well and Stevens Explorations. Mullans are also shown and some others including A Hudsons Bay Trail.
Old folds with some browning at folds. Image is 24x60, uncolored as issued.