Map of the territory of Montana : with portions of the adjoining territories / compiled and drawn by W.W. De Lacy, civil engineer & surveyor, Helena, M.T.De Lacy, W. W. (Walter Washington), 1819-18921872"Entered according to act of Congress in the year 1871 by G.W. & C.B. Colton & Co. in the office of the Librarian of Congress at Washington."Also shows mines, military reserves, and Indian reserves.Includes inset of "Map of the northwestern portion of the United States."Prime meridians: Greenwich and Washington.Relief shown by hachures.cartographic