File:Filling the Under Channels of Poe Lock Preparatory to Opening for Navigation - The Soos of to-day, American and Canadian - the key to the Great Lakes, a nation's commerce passes by its doors.jpg
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![File:Filling the Under Channels of Poe Lock Preparatory to Opening for Navigation - The Soos of to-day, American and Canadian - the key to the Great Lakes, a nation's commerce passes by its doors.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/e/eb/Filling_the_Under_Channels_of_Poe_Lock_Preparatory_to_Opening_for_Navigation_-_The_Soos_of_to-day%2C_American_and_Canadian_-_the_key_to_the_Great_Lakes%2C_a_nation%27s_commerce_passes_by_its_doors.jpg/732px-thumbnail.jpg?20220121145110)
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