Mets announce Jerry Koosman number retirement date –
Tom Seaver, heart and mighty arm of Miracle Mets, dies at 75
Tom Seaver Dead: Mighty Arm of Miracle Mets Was 75 – The Hollywood Reporter
Mets retire Koosman's 36 five decades after '69 heroics
Mets to Retire Jerry Koosman's Jersey - The New York Times
Jerry Koosman: NY Mets legend on jersey retirement, World Series
Jerry Koosman to Have Number Retired on August 28, 2021 - Metsmerized Online
Jerry Koosman's No 36 to be retired by Mets in June
New York Mets retire Keith Hernandez No. 17 jersey
Mets should retire Jerry Koosman's number this year regardless of 2020 season outcome