'Entered according to Act of Congress in the year 1865 by S. Augustus Mitchell, Jr. in the Clerk's office of the District Court of the U.S. for the Eastern District of Pennsylvania . Drawn and engraved by W.H. Gamble, Philadelphia.' Shows roads, overland telegraph route, and other features. Relief shown by hachures and spot heights. Prime meridians: Greenwich and Washington. Scale [ca. 1:2,787,840] (W 120°--W 109°/N 43°--N 36° 59?).