Rio Colorado of the West; explored by 1st. Lieut. Joseph C. Ives, Topl. Engrs. under the direction of the Office of Explorations and Surveys, A.A. Humphreys, Capt. Topl. Engrs. in charge, by order of the Hon. John B. Floyd, Secretary of War; drawn by Frhr. F.W. v. Egloffstein, topographer to the expedition.; Explorations and Surveys, War Department, map no. 2. Maps University Of Michigan

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