Map of the territory of Montana with portions of the adjoining territories / compiled and drawn by W.W. De Lacy of the Surveyor General's Office, Helena, M.T. ; engraved, printed and published by G.W. & C.B. Colton & Co.De Lacy, W. W. (Walter Washington), 1819-18921870"Entered according to Act of Congress in the year 1870 by W.W. DeLacy in the Office of the Librarian of Congress at Washington."Includes bibliographic references.Inset: Map of the northwestern portion of the United States. Scale [ca. 1:7,200,000]. Shows area from Lake Michigan to the Pacific Ocean.Prime meridians: Greenwich and Washington.Relief shown by hachures.Shows Indian/"military reserves," areas mined for gold, silver, copper, iron and coal, and Yellowstone region.cartographic