This primary source comes from the Records of the Bureau of Indian Affairs.
Full Citation: Sketch of the Northwestern part of California; 1851; Central Map File, 1824 - 1960; Records of the Bureau of Indian Affairs, Record Group 75; National Archives at College Park, College Park, MD. [Online Version, https://www.docsteach.org/documents/document/sketch-northwestern-california, May 9, 2024]