Muhammad Ali taunts rival Joe Frazier at Frazier's training camp in Philadelphia, 1971. (John Shearer—Time & Life Pictures/Getty Images)

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Muhammad Ali taunts rival Joe Frazier at Frazier's training camp in Philadelphia, 1971. (John Shearer—Time & Life Pictures/Getty Images)

Click here to see the full collection at LIFE.com less 
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Fri, Mar 8, 2013 2:00 AM EST