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Jerry Koosman number retirement set for June 13 - Amazin' Avenue
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Happy birthday to #Mets legend, Jerry Koosman!
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Mets to Retire Jerry Koosman's Jersey - The New York Times
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New York Mets Jerry Koosman in action, pitching vs St. Louis News Photo - Getty Images
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Mets to Retire Jerry Koosman's Jersey - The New York Times
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Jerry Koosman signed baseball – Papa Hawk Sports & Collectibles LLC
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Jerry Koosman: Playoff Ace for NY Mets - Mets History
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April 23, 1969: Jerry Koosman gets his first win in Mets' miracle season – Society for American Baseball Research
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The perpetually underrated Jerry Koosman – Mets360