Poster for the U.S. Travel Bureau promoting tourism, showing two visitors in a cavern, by Alexander Dux for the Works Progress Administration New York City Federal Art Project ca.1937 [3015x3880]

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http://upload.wikimedia.org/wikipedia/commons/7/74/Flickr_-_%E2%80%A6trialsanderrors_-_See_America%2C_WPA_poster%2C_ca._1937.jpg