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Ukrainian heavyweight champion Wladimir Klitschko (R) is pictured Stock Photo - Alamy
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JACK JOHNSON (1878-1946) American boxer who was World Heavyweight Champion 1908-1915 Stock Photo - Alamy
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Amazon.com: The Boxing Kings: When American Heavyweights Ruled the Ring (9781442272897): Beston, Paul: Books
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NWA National Heavyweight Championship - Wikipedia
