The Yankees have retired so many numbers that they're down to just four available for new recruits: 38, 50, 57 and 69. : r/baseball
A-Rod: 'It bothers me' Yankees haven't retired my number : r/NYYankees
New York Yankees on LinkedIn: Yankees to Retire Paul O'Neill's No. 21
Paul O'Neill still gets fired up thinking about 1996 and the Yankees' dynasty years – New York Daily News
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NY Yankees retire Paul O'Neill's No. 21
Paul O'Neill's No. 21 to be retired by Yankees
New York Yankees on LinkedIn: Yankees to Retire Paul O'Neill's No. 21
New York Yankees to retire Paul O'Neill's jersey number during 2022 season - Sports Illustrated NY Yankees News, Analysis and More
Aaron_Boone
NY Yankees royalty honored as Paul O'Neill's No. 21 is retired
New York Yankees on LinkedIn: Yankees to Retire Paul O'Neill's No. 21
As Paul O'Neill's No. 21 Is Retired, One Last Kick of a Water Cooler - The New York Times
The Yankees Retire Paul O'Neill's Number 21 - The New York Times