War Department, Corps of Engineers. 1 map : col. ; 92 x 61 cm. Scale 1:80,000. (W 79⁰20-́-W 78⁰20/́N 43⁰05-́-N 42⁰25)́. "With additions and corrections." "Issued May 27, 1908." Depths shown by isolines, tints, and soundings. "Aids to navigation corrected from information received to May 27, 1908." "Survey of the northern and northwestern lakes, made in obedience to acts of Congress, and orders of the Chief of Engineers, U.S. Army." Includes text and tables of magnetic variations, comparative elevations of water levels on Lake Erie, canals, dry docks, and opening and closing of navigation. "Catalogue no. 31."