The Cubs should retire several more jersey numbers - Bleed Cubbie Blue

Cubs Dumping CUBS Block-Letter Alternate Jersey - Bleed Cubbie Blue

The Cubs should retire several more jersey numbers - Bleed Cubbie Blue

Cubs - Gapers Block Tailgate

Cubs by the Numbers: A Complete Team History of the Chicago Cubs by Uniform Number by Al Yellon, Kasey Ignarski, Matthew Silverman, Paperback

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Cubs All-Time Uniform Number List

Larry Biittner – Society for American Baseball Research

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