The Last boat down, Locale based on negative D4-21812., "1544" on negative., Detroit Publishing Co. no. 021811., Gift; State Historical Society of Colorado; 1949, Hutchinson (Freighter) , Cargo ships. , Locks (Hydraulic engineering) , Winter. , United States, Michigan, Sault Sainte Marie.

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Keywords: (hydraulic, ., .., cargo, hutchinson, locks, ships.