This undated postcard from Zenith Interstate News Company shows a freighter exiting the Duluth shipping canal into Lake Superior.
The caption on the back reads:
Giant Freighter Leaving Duluth-Superior Harbor
The annual shipping tonnage from this most westerly port on Lake Superior is second only to that of New York City. Iron ore, wheat, meat, butter, eggs and other dairy products are the major cargoes shipped down the Great Lakes.
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