At head of title: Survey of the northern and northwestern lakes. Made in obedience to Acts of Congress, and orders from the Headquarters of the Corps of Engineers, War Department.
Includes: Sailing directions -- Magnetic variations -- Lighthouses -- Water table -- Dangers -- Note.
Projected from a trigonometrical Survey executed under the orders of Major C.B. Comstock, Corps of Engineers, Brvt. Brig. Gen. U.S.A., in 1873, 1874, and 1875.