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The Yankees Retire Paul O'Neill's Number 21 - The New York Times
Yankees to retire Paul O'Neill's No. 21: See the complete list of retired numbers
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As Paul O'Neill's No. 21 Is Retired, One Last Kick of a Water Cooler - The New York Times
Yankees' retirement of Paul O'Neill's number might be a stretch - Pinstripe Alley
Yankees retired numbers: Paul O'Neill latest to be added to list
Paul O'Neill (baseball) - Wikipedia
Joe_Torre
Paul O'Neill discusses number retirement by Yankees
Paul O'Neill Number Retirement before Yankees vs. Blue Jays on Sunday, August 21, 2022