A number of nuggets about retired numbers around the Major League
Twins' all-time retired numbers
Which NBA team has the most jersey numbers retired? - AS USA
NBA -- Inside the numbers on the NBA's retired numbers - ESPN
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Over 47 years, the Nuggets have retired these 6 numbers
Appreciating the retired single-digit numbers of the New York Yankees
Twins' all-time retired numbers
Next retired number for every MLB team
History of Celtics retired numbers - CelticsBlog
How many former Lakers players have had their numbers retired? Complete list - AS USA
All of the current NBA players deserving of jersey retirements
Every MLB team's retired numbers
Bill Russell and Jackie Robinson: Why are they the NBA's and MLB's picks to retire their numbers from every team?
List of National Basketball Association retired numbers - Wikipedia
Jackie Robinson Day, when MLB players can wear No. 42
Retired Uniform Numbers in the National League