Yankees news: New York announces Paul O'Neill's jersey retirement
Forty-Sixed: a needlessly lengthy look at the Yankees' needlessly extensive history (and future) of retired numbers - Pinstripe Alley
Paul O'Neill (baseball) - Wikipedia
NY Yankees royalty honored as Paul O'Neill's No. 21 is retired
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Paul O'Neill returning to YES Network broadcast booth for Yankees games
Paul O'Neill's No. 21 to be retired by Yankees
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Number 21 Continues to Remain Sacred to the New York Yankees, News, Scores, Highlights, Stats, and Rumors