Mets will retire Jerry Koosman's number in 2020 – New York Daily News
Mets Great Tom Seaver Dies At 75
Mets to Retire Jerry Koosman's Jersey - The New York Times
Jerry Koosman to Have Number Retired on August 28, 2021 - Metsmerized Online
MORE
Mets retire Koosman's 36 five decades after '69 heroics
New York Mets should consider these four players for jersey retirement
Mets To Retire Hernandez's Number In Coming MLB Season
Jerry Koosman's No 36 to be retired by Mets in June
Keith Hernandez Caught Off Guard By Jersey Retirement, Reveals Mets' Old-Timers' Day Plans - Sports Illustrated New York Mets News, Analysis and More
Jerry Koosman's number retirement, 08/28/2021
Tom Seaver was the one who first made Mets fans believe
Thrilled to be 'joining a great crew,' Jerry Koosman, 78, has jersey retired by New York Mets - ESPN