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List of National Football League retired numbers - Wikipedia
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Denver Nuggets - Wikipedia
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List of NCAA men's basketball retired numbers - Wikipedia
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Every NBA Team's Retired Numbers - Fadeaway World
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List of National Football League retired numbers - Wikipedia
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Boston Celtics accomplishments and records, Boston Celtics Wiki
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Complete list of retired numbers in the NBA - AS USA
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National Basketball Retired Players Association (NBRPA)
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Retired number - Wikipedia