This primary source comes from the Records of the Office of the Chief Signal Officer.
National Archives Identifier:
530910Full Citation: Typical stage of the Concord type used by express companies on the overland trails. Soldiers guard from atop; ca. 1869; Records of the Office of the Chief Signal Officer, Record Group 111. [Online Version, https://docsteach.org/documents/document/typical-stage-of-the-concord-type-used-by-express-companies-on-the-overland-trails-soldiers-guard-from-atop, May 9, 2024]