North American Boundary CommissionScale varies on profile.; "Archibald Campbell, Esq., Commissioner ... Compiled from reconnaissances by the various parties under command of Capt. Wm. J. Twining, chief astronomer, and Capt. James F. Gregory, Lieut. Francis V. Greene, assistants."39 x 54 centimetersJPEGUMN_ALMA:9931984290001701engThe Commission (Washington, D.C)PublicReconnaissance maps : six sheets and a profile showing the general features of the topography adjacent to the 49th parallel from the Lake of the Woods to the Rocky MountainsMapsUniversity of Minnesota