This product is an original 1884 antique map of Calumet Harbor Illinois published by the U.S. Chief of Engineers and measures 10.25x7.25 inches. Rare and very detailed U.S. Corps Engineers nautical survey map of Calumet Harbor Chicago with Soundings, entrance, railroads and River entrance. Perfect for collectors and enthusiasts of antique maps, this map is a valuable piece of North American cartographic history. Good condition, discoloration, creases as issued