Yankees to honor Mariano Rivera with a plaque in Monument Park on August 14. : r/baseball
New York Yankees retire Paul O'Neill's No. 21; GM Brian Cashman, owner Hal Steinbrenner booed by fans - ESPN
The Yankees Retire Paul O'Neill's Number 21 - The New York Times
Paul O'Neill Number Retirement Raises Debate - Last Word On Baseball
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New York Yankees Announce Retirement of Paul O'Neill's Number 21 – Celeb Secrets
Paul O'Neill on No. 21 retirement Yankees
Have the NY Yankees retired too many numbers? - Quora
Yankees retire Paul O'Neill's No. 21 jersey - NBC Sports
New York Yankees to retire Paul O'Neill's No. 21 on Aug. 21
New York Yankees history: Paul O'Neill's number 21 must be retired
New York Yankees on LinkedIn: Yankees to Retire Paul O'Neill's No. 21