Notes:
Phrase "What? Me Worry?" is used for the first time in MAD. First 25 cent, magazine size issue.
On sale date as given in the copyright application as listed in the Catalog of Copyright Entries, Periodicals, January-June 1955, page 89, registration number B533230.
This issue sold well enough that it promptly underwent a second printing (Kitchen 2009, 77 and 109).
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Reference:
Kitchen, Denis, and Paul Buhle. 2009. The Art of Harvey Kurtzman: The Mad Genius of Comics. New York: Abrams ComicArts.