As Paul O'Neill's No. 21 Is Retired, One Last Kick of a Water Cooler - The New York Times
All-Star Paul O'Neill's No. 21 jersey to retire on Aug. 21
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Yankees news: New York announces Paul O'Neill's jersey retirement
New York Yankees Announce Retirement of Paul O'Neill's Number 21 – Celeb Secrets
NY Yankees retire Paul O'Neill's No. 21
New York Yankees to retire All-Star Paul O'Neill's No. 21 jersey
New York Yankees to retire Paul O'Neill's No. 21 on Aug. 21 - The San Diego Union-Tribune
Yankees' retirement of Paul O'Neill's number might be a stretch - Pinstripe Alley