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As Paul O'Neill's No. 21 Is Retired, One Last Kick of a Water Cooler - The New York Times
Opposing fans need to shut up about Yankees retiring Paul O'Neill's number
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Yankees to retire Paul O'Neill's No. 21 jersey this summer - Newsday
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This Day in Yankees History: The Yankees retire Don Mattingly's number - Pinstripe Alley
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Yankees retired numbers: Paul O'Neill latest to be added to list