This primary source comes from the Records of the Office of the Chief Signal Officer.
National Archives Identifier:
530424Full Citation: Union breastworks. Interior view of breastworks on Little Round Top, Gettysburg.; 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/union-breastworks-interior-view-of-breastworks-on-little-round-top-gettysburg, January 13, 2025]