This primary source comes from the Records of the Office of the Chief Signal Officer.
National Archives Identifier:
524768Full Citation: Wounded soldiers under trees, Marye's Heights, Fredericksburg. After the battle of Spotsylvania, 1864.; 1864; 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/wounded-soldiers-fredericksburg-after-battle-spotsylvania, October 13, 2024]