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comicsvalue.com - Superman vs Muhammad Ali DC Treasury Edition #C-56 CBCS (9.2) 1978 - auction details
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Amazon.com: All-New Collectors' Edition #C-56 (Superman Vs. Muhammad Ali): O'Neil, Denny (writer); Adams, Neil (illustrator): Books
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Amazon.com: NECA DC Comics Superman vs Muhammad Ali Special Edition Action Figure (2 Pack), 7", multi-colored : Toys & Games
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