Yankee Retired Numbers: The All-Time Numerical Lineup of Yanks
Here are the Yankees' 21 retired numbers Who belongs and who doesn't? Andy Pettitte, Jorge Posada, Bernie Williams, more
The Yankees Retire Paul O'Neill's Number 21 - The New York Times
Manager Numbers. Had a little fun over at MLB — I picked…, by Joe Posnanski, Joe Blogs
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Predicting the Next Retired Number for Every Team - The Crawfish Boxes
Yankees Retired Numbers
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List of Major League Baseball retired numbers - Wikipedia