Here are the Yankees' 21 retired numbers Who belongs and who doesn't? Andy Pettitte, Jorge Posada, Bernie Williams, more
New York Yankees history: Paul O'Neill's number 21 must be retired
List of Yankee Retired Numbers in Monument Park - Newsday
Readers sound off on Yankees retired numbers, the GOP and the 9/11 Tribute Museum – New York Daily News
Yankees will retire Paul O'Neill's No. 21 jersey in August at Yankee Stadium's Monument Park
Yankees Retired Numbers - Who Are The 22 Yankees Who Wore Them
Yankees retired numbers: Paul O'Neill latest to be added to list
Yankees Retired Numbers
New York Yankees: Retiring numbers, plaque ceremonies must end
The Yankees Retire Paul O'Neill's Number 21 - The New York Times
Next retired number for every MLB team
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List of Major League Baseball retired numbers - Wikipedia
Every Yankees Retired Number
Yankees retired numbers: Paul O'Neill latest to be added to list