This primary source comes from the Records from the War Department.
National Archives Identifier:
305657Full Citation: [A panel of eight sketch maps.] Mountain Passes Practicable for Wagons from Cumberland Gap to Winters' Gap.; ca. 1861 - ca. 1865; Records from the War Department. [Online Version, https://www.docsteach.org/documents/document/[a-panel-of-eight-sketch-maps]-mountain-passes-practicable-for-wagons-from-cumberland-gap-to-winters-gap, April 25, 2024]