This primary source comes from the Records of the Office of the Chief Signal Officer.
National Archives Identifier:
528988Full Citation: Aquia Creek and Fredericksburg Railroad, construction corps at work, VA; 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://www.docsteach.org/documents/document/aquia-creek-and-fredericksburg-railroad-construction-corps-at-work-va, October 9, 2024]