Mets to retire 1969 World Series hero Koosman's number in August

Jeff Jacobs: A 14-year-old fan, Tom Terrific and Oma's Metsies — how baseball marks time

Friendship, memories and a year with the 1969 New York Mets - ESPN

New York Mets, ArmchairGM Wiki

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Mets retire Koosman's 36 five decades after '69 heroics

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Jerry Koosman: Playoff Ace for NY Mets - Mets History

Remembering Mets History (1973): Jerry Koosman Wins April NL Pitcher of the Month

October 12, 1969: Koosman leads Mets to first World Series win in Game Two – Society for American Baseball Research

The Mets' Tom Seaver Was Called The Franchise. for a Reason, He Was Terrific. - HubPages

Memories still fresh as Mets celebrate 1969 World Series title's 50th anniversary

Jerry Koosman to Have Number Retired on August 28, 2021 - Metsmerized Online

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Mets to Retire Jerry Koosman's Jersey - The New York Times

Tom Seaver - Wikipedia