This primary source comes from the Records of the Office of the Chief Signal Officer.
National Archives Identifier:
530059Full Citation: Printing presses at Bureau of Engraving and Printing; ca. 1860 - 1865; Mathew Brady Photographs of Civil War-Era Personalities and Scenes, 1921 - 1940; Records of the Office of the Chief Signal Officer, Record Group 111. [Online Version, https://docsteach.org/documents/document/printing-presses-at-bureau-of-engraving-and-printing, May 7, 2024]