Montana Territory / compiled under direction of Lieut. Edward Maguire, Corps of Eng'rs by Prvt. Julius J. Durage, Topog'l. Asst.United States. War Dept. Corps of Engineers1881"Compiled under direction of Capt. D.P. Heap, Corps of Engineers, W.H. Wood, May 1872.""Prepared by order of Maj. Gen'l. W.S. Hancock."Relief shown by hachures.cartographic