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Cubs to retire No. 31 worn by Jenkins, Maddux
Wrigley100 -- Chicago Tribune
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Padres No-Hitters: Imperfect games - The San Diego Union-Tribune
Don Sutton – Society for American Baseball Research
File:Retired numbers of Chicago Cubs (Williams, Sandberg, Maddux).jpg - Wikimedia Commons
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2014 Cubs Media Guide, PDF, Wrigley Field
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