This primary source comes from the Records of Boundary and Claims Commissions and Arbitrations.
Full Citation: Active Passage. Saturna Group, looking West; 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/active-passage-saturna-group-looking-west, September 9, 2024]