1969 9/26 Life magazine baseball Jerry Koosman, New York Mets VG
This Day in NY Mets History: Jerry Koosman makes his MLB debut
1969 World Series - Wikipedia
Mets to retire Jerry Koosman's No. 36 in June - Newsday
This Date In Mets History: September 16 — 20 Wins for Koosman, 20
Jerry Koosman - Mets History
The 24 best players in New York Mets history
Jerry Koosman's Mets number retirement is finally here
Heroes of '69: Jerry Koosman Lived For The Big Games - Metsmerized