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Yankees retire Paul O'Neill's No. 21 jersey, Cashman booed
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Mariano Rivera Will Retire After the Season—Yankees - WSJ
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Yankees honor Rivera with ceremony to retire his No. 42 – Trentonian
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Yankees to retire Paul O'Neill's No. 21: See the complete list of retired numbers
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Mariano Rivera Wearing Jackie Robinson's 42 to the End - The New York Times
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File:YankeesRetired42 Rivera.svg - Wikimedia Commons
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Mariano Rivera Reveals Postseason Success Secrets
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Rivera, Mariano Baseball Hall of Fame
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Mariano Rivera's Retirement: How to Send Off a Legend - WSJ