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Yankees Retired Numbers: 5 Fast Facts You Need to Know
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Yankees retire Paul O'Neill's No. 21 jersey, Cashman booed
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Yankees to retire numbers of Andy Pettitte, Jorge Posada and Bernie Williams - ABC7 New York
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Are there any other Yankees who should have their numbers retired? - Pinstripe Alley
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Jeter returns as Yankees honor 1998 team at Old-Timers' Day, Boone booed by some
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Jeter returns as Yankees honor 1998 team at Old-Timers' Day, Boone booed by some - ABC News
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A mathematical examination of when the Yankees will run out of numbers to retire
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Derek Jeter's No. 2 officially retired by Yankees, National Sports
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NY Yankees retire Paul O'Neill's No. 21