Paul O'Neill talks jersey number retired by New York Yankees
Yankees retire Paul O'Neill's No. 21 jersey, Cashman booed – WATE 6 On Your Side
As Paul O'Neill's No. 21 Is Retired, One Last Kick of a Water Cooler - The New York Times
New York Yankees retire Paul O'Neill's No. 21; GM Brian Cashman, owner Hal Steinbrenner booed by fans - ESPN
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Paul O'Neill (baseball) - Wikipedia
NY Yankee Paul O'Neill's No. 21 to be retired on Aug. 21
Paul O'Neill Number Retirement Ceremony
Hal Steinbrenner
Yankees Retired Numbers