New York Yankees retired Paul O'Neill's No. 21 jersey
Paul O'Neill on No. 21 retirement Yankees
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Yankees retire Paul O'Neill's No. 21 jersey, Cashman booed
Paul O'Neill remembered as one of great Yankees
New York Yankees history: Paul O'Neill's number 21 must be retired
New York Yankees set to retire legendary Paul O'Neill's No. 21
Paul O'Neill (baseball) - Wikipedia
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Yankees retire Paul O'Neill's No. 21 jersey - NBC Sports
The Yankees Retire Paul O'Neill's Number 21 - The New York Times