Here are the Yankees' 21 retired numbers
Paul O'Neill Yankees No. 21 retired
Every Yankees Retired Number
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Predicting the Next Retired Number for Every Team - The Crawfish Boxes
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September 21, 2008: The final game at Yankee Stadium – Society for American Baseball Research
New York Yankees retired numbers: Is team too generous? - Sports Illustrated
New York Yankees Retired Numbers - - Database of Yankee Uniform Numbers Through the Years
Buckley: If it feels right, like with Paul Pierce, retire the number – Boston Herald
The Yankees Retire Paul O'Neill's Number 21 - The New York Times
Here are the Yankees' 21 retired numbers Who belongs and who doesn't? Andy Pettitte, Jorge Posada, Bernie Williams, more
Who replaces Derek Jeter? Some names 2 consider
Every Yankees Retired Number
Yankees: 3 NYY Legends Who Should Have Their Numbers Retired
New York Yankees retired numbers: Is team too generous? - Sports Illustrated
Derek Jeter's No. 2 retired: See all New York Yankees retired numbers
