As Paul O'Neill's No. 21 Is Retired, One Last Kick of a Water Cooler - The New York Times
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Why are the New York Yankees retiring Paul O'Neill's number 21 on August 21, 2022? What is your unedited opinion about it? - Quora
Paul O'Neill Number Retirement Raises Debate - Last Word On Baseball
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New York Yankees history: Paul O'Neill's number 21 must be retired
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