By the Numbers: Retired Digits
List of National Basketball Association retired numbers - Wikipedia
They Had Great Credit Scores. Then They Retired. - WSJ
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History of retired numbers dates back to Lou Gehrig Day
History of retired numbers dates back to Lou Gehrig Day
NFL jersey number rules, explained: Why these players changed
Steelers 'Digit Dynasty': Who wore the number best? No.51-75
Retired number - Wikipedia
Yankees are running out of single-digit numbers
NHL Numbers That Never Should Have Been Retired
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All-time list of retired numbers in the NBA
Yankees retired numbers
Magic Johnson Paid Tribute to Kobe Bryant With 2 Jersey Numbers