Mississippi River Life Savers - Free Spot the Differences

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Mississippi River Life Savers

We salute this U. S. Coast Guard vessel docked in Dubuque with a 15-difference picture puzzle.
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Credit line: Photographs in the Carol M. Highsmith Archive, Library of Congress, Prints and Photographs Division.

To view the original image: http://www.loc.gov/pictures/collection/highsm/item/2016630405/