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21 minutes aggregating American Association broadcast Buffalo bulk freighters bushels per hour Canadian fleet Canadian ports Canadian vessels candlepower cargo handling channels coal Committee is composed cooperation courses deck Detroit Detroit River dispatch distributed docks equipped established freight full season Government gross tons harbor of refuge head of Lake iron Lake Carriers Lake Erie ports Lake Huron Lake Michi Lake Michigan Lake Ontario Lake ships Lake Superior Lake vessels Lawrence River legislation licenses load lines locks and canals Mackinac major Marys River miles million bushels Montreal movement Navigation Committee nearly ocean ships Ogdensburg open lake operated Port Facilities Port Huron port on Lake radio radiobeacons raise of grade River connecting lakes safe navigation safety seamen ships built ships engaged similar Specialized Trade square miles Straits of Mackinac Superior and Huron tion tons per hour Type of Ships United States vessels Wages Welland Ship Canal