21. Charts. St. Lawrence River; with inset, Harbors at Ogdensburg, N. Y., and Prescott, Ontario; St. Lawrence River chart 3. Scale 1:30,000. Bookmark Corporate/Agency Authors: Northern and Northwestern Lake Survey, Engineer Department, and War Department Publisher: Northern and Northwestern Lake Survey Date: Sept. 1930 SuDoc number: W 33.6/1:3/7