This primary source comes from the Records of the Office of the Chief Signal Officer.
National Archives Identifier:
526238Full Citation: Ford's Theatre, chair in which President Lincoln was sitting when shot; 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://www.docsteach.org/documents/document/fords-theatre-chair-in-which-president-lincoln-was-sitting-when-shot, May 7, 2024]