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Rich tradition of retired numbers part of game's legacy
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MLB allows more players to wear No. 21 to honor Roberto Clemente – NBC Sports Chicago
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High and Tight: Our Rock & Roll Baseball Experts Talk Retired Numbers
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Da Greats: Retired Chicago Bears Jersey Numbers - The Chicago Audible
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Los Angeles Dodgers to retire Fernando Valenzuela's No. 34 jersey
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Last player to wear No. 42 for each MLB team
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List of Major League Baseball retired numbers - Wikipedia
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Retired Uniform Numbers in the American League
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Retired Uniforms by Division: National League East - Beyond the Box Score
![Retired Uniform Numbers in the National League](http://assets.sbnation.com/assets/617359/NLW_tot.png)
Retired Uniforms by Division: National League West - Beyond the Box Score
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Retired Jerseys - Army West Point
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Mets to retire numbers of Darryl Strawberry, Doc Gooden
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Every MLB team's retired numbers – NBC Sports Chicago
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Fascinating Aspects About the Retired Uniform Numbers of the Detroit Tigers – Society for American Baseball Research