Here are the Yankees' 21 retired numbers
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The Yankees Retire Paul O'Neill's Number 21 - The New York Times
New York Yankees to retire Paul O'Neill's jersey number during 2022 season - Sports Illustrated NY Yankees News, Analysis and More
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New York Yankees retired numbers: Is team too generous? - Sports Illustrated
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Yankees Retired Numbers - Who Are The 22 Yankees Who Wore Them
Southern California teams' retired numbers – Orange County Register
NY Yankees royalty honored as Paul O'Neill's No. 21 is retired
NY Yankees royalty honored as Paul O'Neill's No. 21 is retired