Scale 1:3,800,000. 1 in. to 60 miles (W 126°--W 86°/N 48°--N 30°) ; 1 map : col. ; 57 x 85 cm ; Relief shown by hachures ; Prime meridian: Greenwich and Washington, D.C. ; "Entered according to act of Congress in the year 1882 by G.W. & C.B. Colton & Co. in the office of the Librarian of Congress, at Washington." ; Rufus Adams