This primary source comes from the Records of the Office of the Chief Signal Officer.
National Archives Identifier:
530913Full Citation: Tree burial of the Oglala Sioux [Horsemen] near Fort Laramie, Wyoming; Records of the Office of the Chief Signal Officer, Record Group 111. [Online Version, https://www.docsteach.org/documents/document/tree-burial-of-the-oglala-sioux-[horsemen]-near-fort-laramie-wyoming, May 12, 2024]