At head of title: Survey of the northern and north western lakes. Made in obedience to acts of Congress and orders from the Headquarters of the Corps of Engineers, War Department.
Projected from a Trigonometrical Survey and executed under the orders of Major C.B. Comstock, Corps of Engrs, Brvt. Brig. Genl. U.S.A. and from local Surveys made by J.R. Mayer. 1872.