Saint Lawrence River chart no. 2 : projected from trigonometrical surveys / executed under the orders of Major C. B. Comstock, Corps of Engineers, Brvt. Brigadier General U.S.A. in 1871, 1872 and 1873 ; Hydrography of Galop Rapids by Lieut. W.R. LivermoreU.S. Lake Survey1873]"Made in obedience to acts of Congress and orders from The Headquarters of the Corps of Engineers, War Department".At head of title: Survey of the Northern and Northwestern Lakes.Depth shown by soundings.Includes text.cartographic