Martha's Vineyard Mural - Free Spot the Differences

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Martha's Vineyard Mural

Can you find the 13 differences between the two images of a mural depicting the Massachusetts island's history?
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Credit: Photographs in Carol M. Highsmith's America Project 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/2019689887/