This primary source comes from the Records of Boundary and Claims Commissions and Arbitrations.
Full Citation: Camp Sumass. Sumass Prairie, looking N; 1857 - 1862; Landscape Drawings of the Area Along the Northwest Boundary, 1857 - 1862; Records of Boundary and Claims Commissions and Arbitrations, Record Group 76; National Archives at College Park, College Park, MD. [Online Version, https://docsteach.org/documents/document/camp-sumass-sumass-prairie-looking-n, April 29, 2024]