Yankees retire Posada's No. 20
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What Other Numbers Might the Yankees Be Retiring in the Near Future?
Yankees' Jorge Posada gets number retired, plaque in Monument Park
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Yankees to retire numbers of Posada and Bernie, too
Where Derek Jeter ranks among Yankees' retired single-digit numbers
Former Yankees who wore No. 2 share memories of number and Derek Jeter – New York Daily News
Pettitte, Williams, Posada honored - ABC7 San Francisco
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New York Yankees to retire Paul O'Neill's No. 21 on Aug. 21
JORGE POSADA SIGNED YANKEES CUSTOM JERSEY W/ RETIREMENT PATCH - BECKETT
Jorge Posada - Wikipedia