As Paul O'Neill's No. 21 Is Retired, One Last Kick of a Water Cooler - The New York Times
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Yankees to retire Derek Jeter's number on May 14 - Sports Illustrated
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José Bautista officially retires as a Blue Jay: 'It was a great feeling and I'll forever remember that'
Roy Halladay: Phillies to retire number for Hall of Famer
List of Major League Baseball retired numbers - Wikipedia
Blue Jays un-retire #12 for new reliever Jordan Hicks - Bluebird Banter
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