How Paul O'Neill Stacks Up Against the Other Yankees With Retired Numbers
NY Yankees royalty honored as Paul O'Neill's No. 21 is retired
New York Yankees retire Paul O'Neill's No. 21; GM Brian Cashman, owner Hal Steinbrenner booed by fans - ESPN
Yankees to retire Paul O'Neill's number prior to August game against Toronto - CBS New York
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Paul O'Neill discusses number retirement by Yankees
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The Yankees need to reissue Paul O`Neill's no. 21 - Pinstripe Alley
After Paul O'Neil, Should The New York Yankees Stop Retiring Numbers? - EssentiallySports
Ask Pinstripe Alley 1/11/17: Will the Yankees ever retire Paul O'Neill's number? - Pinstripe Alley
NY Yankees royalty honored as Paul O'Neill's No. 21 is retired
Former New York Yankees Coach Pens Powerful Insider Book
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There will never be another
