Paul O'Neill Yankees No. 21 retired
Yankees to retire numbers of Pettitte, Williams, Posada - Sports
Yankees' Jorge Posada gets number retired, plaque in Monument Park
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Jorge Posada's number retired by New York Yankees - ESPN
Here are the Yankees' 21 retired numbers
Jorge Posada has his No. 20 retired by the Yankees - NBC Sports
Yankees to retire star shortstop Derek Jeter's No. 2
Yankees retire Jorge Posada's No. 20 in Monument Park
Yankees to retire numbers of Pettitte, Posada and Williams
Emotional Andy Pettitte says thanks as New York Yankees retire his
Yankees announce next player to have his number retired at Yankee
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Yankees retired numbers and the baseball legends who wore them
Derek Jeter's No. 2 retired: See all New York Yankees retired