Retired Numbers, History
Retired number - Wikipedia
File:Retired Numbers in Left Field at Citi Field.jpg - Wikipedia
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The history - and expedience - of the Twins retiring jersey numbers - Twinkie Town
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Have the Yankees taken retired numbers too far?, Bronx Pinstripes
File:Adelaide 36ers retired numbers.jpg - Wikipedia
History of retired numbers dates back to Lou Gehrig Day
File:Miller Park Retired Numbers (4953172314).jpg - Wikimedia Commons
Every MLB team's retired numbers
Every MLB team's retired numbers
