New York Yankees history: Paul O'Neill's number 21 must be retired
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Yankees Retired Numbers
The Yankees Retired Derek Jeter's Number, and Things Got Slightly
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New York Yankees Retired Numbers - Sports Illustrated
After 65 Years, A Joltin' Discovery at the Hall of Fame
New York Yankees, History & Notable Players
Uniform numbers for Yankees coaches, managers could soon be thing
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NY Yankees royalty honored as Paul O'Neill's No. 21 is retired
Derek Jeter's No. 2, Last of Yankees' Single Digits, to Be Retired
Where Derek Jeter ranks among Yankees' retired single-digit
Here are the Yankees' 21 retired numbers