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Dressing the set of "Mad Men" with the OED may have seemed like a clever touch, but... as DSNA members Ben Zimmer and Orion Montoya point out, the designers needed to take a closer look at the dictionary's colophon... See Ben's entertaining article "Not so Mad Props: A 'Mad Men' Anachronism," at the Visual Thesaurus, http://visualthesaurus.com/cm/wordroutes/1961/.