Anderson, S., &amp; Weller, E. (1876). <i>Map of the North West Territory: illustrating the British and United States boundary line. Surveyed and marked out by the Joint Commission, 1872-3-4. To accompany the paper by Captn. Anderson R.E. / [engraved by] Edwd. Weller, F.R.G.S.</i> London: John Murray.