Former Cubs manager Don Zimmer -- Chicago Tribune

Jim Frey, former manager and GM who led the Chicago Cubs to their first 2 division titles, dies at 88

Zim: A Baseball Life: 9781930844193: Zimmer, Don, Madden, Bill: Books

Former Cubs manager Don Zimmer

The Chicago Cubs' College of Coaches: A Management Innovation That Failed – Society for American Baseball Research

Obituary: Jim Frey (1931-2020) – RIP Baseball

Former Cubs manager Don Zimmer dies at 83

Former Rockies coach Don Zimmer dies at 83 – The Denver Post

Former Cubs manager Don Zimmer -- Chicago Tribune

Don Zimmer dead at 83: Longtime Yankees bench coach, original Met and former Brooklyn Dodger was baseball lifer – New York Daily News

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