Freighter in Poe Lock, looking down, Sault Ste. Marie, Mich., Title from jacket., "G 4568" on negative., Detroit Publishing Co. no. 036253., Gift; State Historical Society of Colorado; 1949, Perry G. Walker (Freighter) , Cargo ships. , Locks (Hydraulic engineering) , United States, Michigan, Sault Sainte Marie. , United States, Michigan, Sault Sainte Marie Canal.

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Keywords: (hydraulic, ., cargo, locks, perry, ships., walker