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How players are using uniform numbers to break MLB's unwritten rules - ESPN
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Here are the Yankees' 21 retired numbers Who belongs and who doesn't? Andy Pettitte, Jorge Posada, Bernie Williams, more
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The Worst Players to Wear Each of the 21 Retired Yankees Numbers - Sports Pickle
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Yankees Retired Numbers
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On Uniform No. 0, the Yankees Rule Out Nothing - The New York Times
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New York Yankees: The Numbers on the Wall
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Yankees Legend Mariano Rivera Becomes First Player Elected To Baseball Hall Of Fame Unanimously - CBS New York
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Yankees Retire Derek Jeter's No. 2 In Pregame Ceremony - CBS New York
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NEW YORK YANKEES Joe Dimaggio Vinyl Weatherproof Sticker
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Yankees' Mariano Rivera Is the Last No. 42 - The New York Times