As Paul O'Neill's No. 21 Is Retired, One Last Kick of a Water Cooler - The New York Times
Uncle Mike's Musings: A Yankees Blog and More: July 2018
Paul O'Neill: New York Yankees to retire jersey number
Yankees retire Paul O'Neill's No. 21 jersey, Cashman booed – WATE 6 On Your Side
Paul O'Neill Number Retirement before Yankees vs. Blue Jays on Sunday, August 21, 2022
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Yankees retire Paul O'Neill's No. 21 jersey, Cashman booed
The Yankees Retire Paul O'Neill's Number 21 - The New York Times
New York Yankees set to retire legendary Paul O'Neill's No. 21