Recherche dans la collection - St. Lawrence River. Chart No. 1. Projected from a Trigometrical Survey executed under the orders of Major O.B. Comstoch, Corps of Engrs. & Brvt. Brig. Genl U.S.A. in 1871, 1972 & 1973...Survey of the Northern and North Western Lakes Made in Obedience to acts of Congress and Orders from the Headquarters of the Corps of Engieners. [cartographic material]