Mets honor Jerry Koosman with overdue jersey retirement
Espino's arm, bat lead Nationals over skidding Mets 2-1 - The San Diego Union-Tribune
Mets to retire Koosman's number — Queens Daily Eagle
Jerry Koosman Autographed Jersey - Mets History
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Mets to Retire Jerry Koosman's Jersey - The New York Times
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Jerry Koosman's number retirement, 08/28/2021
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