This primary source comes from the Records of the Office of the Chief Signal Officer.
National Archives Identifier:
524772Full Citation: Cannon of largest size mounted in Fort, at Battery Rodgers; ca. 1860 - ca. 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/cannon-of-largest-size-mounted-in-fort-at-battery-rodgers, March 28, 2024]