Yankees to retire numbers of Pettitte, Williams, Posada - Sports
Yankees to retire Paul O'Neill's No. 21 on Aug. 21
Yankees Retired Numbers: 5 Fast Facts You Need to Know
Yankees to retire Paul O'Neill's No. 21 jersey this summer - Newsday
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Yankees to retire O'Neill's No. 21
Yankees to Retire Paul O'Neill's No. 21 in Pregame Ceremony in August – Brooklyn Sports World/NY NJ Sports World
A mathematical examination of when the Yankees will run out of numbers to retire
Yankees to Wear Bernie Williams Patch on May 24th – SportsLogos.Net News
Yankees retire Paul O'Neill's No. 21 jersey, Cashman booed – KGET 17
Yankees also retiring numbers for Bernie Williams and Jorge Posada
Yankees to retire numbers of Posada and Bernie, too
Yankees to retire Derek Jeter's number on May 14 - SI Kids: Sports News for Kids, Kids Games and More
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