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: Authorities -- Note -- Sailing Directions -- Magnetic Variations-- Water-table -- Light-houses -- Dangers to be avoided.
Projected from a trigonometrical Survey, executed under the orders of Major C.B. Comstock, Corps of Engineers, Brvt. Brigadier General, U.S.A., in 1877 & '78.