Mets will retire Jerry Koosman's number in 2020 – New York Daily News
List of Major League Baseball retired numbers - Wikipedia
Mets Retire Willie Mays' No. 24 During Old Timers' Day Ceremony – NBC New York
NY Mets to retire Jerry Koosman's number next season, Jeff Wilpon says
Jerry Koosman's No 36 to be retired by Mets in June
Mets to retire numbers of Darryl Strawberry, Doc Gooden
JERRY KOOSMAN New York Mets 1969 Home Majestic MLB Throwback Jersey
New York Mets retire Koosman's No. 36 - Taipei Times
Jerry Koosman: NY Mets legend on jersey retirement, World Series
Jerry Koosman to Have Number Retired on August 28, 2021 - Metsmerized Online