Jerry Koosman Jersey Retirement Ceremony
Jerry Koosman's number retirement, 08/28/2021
Jerry Koosman to Have Number Retired on August 28, 2021
Jerry Koosman 1969 Topps All-Star Rookie Card - Mets History
Jerry Koosman to Have Number Retired on August 28, 2021
Mets' next retired numbers prediction
Mets Retire Legendary Pitcher Jerry Koosman's No. 36 - Sports
Jerry Koosman's No. 36 to Be Retired By Mets in June – NBC New York
Jerry Koosman Jersey Retirement Ceremony
Mets retiring No. 36 of ex-pitcher Koosman in '20 - ESPN
Mets to Retire Jerry Koosman's Jersey - The New York Times