Remembering Mets History (1973): Jerry Koosman Wins April NL
This Date in Mets History: April 21 — Jesse Orosco's birthday, '86
Nolan Ryan - Wikipedia
Mets to retire Koosman's number — Queens Daily Eagle
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July 10, 1973: Jon Matlack's one-hitter beats the Astros at Shea
Jerry Koosman: All Time Mets Left Handed Pitcher (Part Two-1973-1978)
Remembering Mets History (1973) An Unusual Double Play Tops Off
Remembering Mets History (1973) Jerry Koosman Shuts Out the Giants
Remembering Mets History (1973): Jerry Koosman Wins April NL
Remembering Mets History (1973) Mets Take 3 of 4 From Phillies
Jerry Koosman - Wikipedia
Remembering Mets History (1973) Ken Boswell's Clutch Pinch Hitting
Mack's Mets: Mets Games Played On This Date: April 22
Jerry Koosman - Mets History