Mets announce Jerry Koosman number retirement date –
Mets honor Jerry Koosman with overdue jersey retirement
Jerry Koosman - Wikipedia
Jerry Koosman number retirement set for June 13 - Amazin' Avenue
Mets to Retire Jerry Koosman's Jersey - The New York Times
Best Jerry Koosman memories: Mets teammates on his talent, toughness and sense of humor
Mets' Jerry Koosman is finally getting the respect he is due
1975 O-Pee-Chee # 19 Jerry Koosman New York Mets (Baseball Card) VG/EX Mets : Collectibles & Fine Art
Jerry Koosman on Tom Seaver, 09/03/2020
Mets to retire 1969 World Series hero Koosman's number in August