Five Red Sox players who should have their jersey numbers retired
What are the Boston Red Sox Retired Numbers?
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Who were the first and last Yankees players to wear the retired numbers? - Pinstripe Alley
Red Sox Retired Numbers
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Every MLB team's retired numbers – NBC Sports Chicago
New York Yankees Retired Numbers Vinyl Decal Stickers
The Yankees' unlucky number: Retire '13' so we can forget the sad A-Rod era – New York Daily News