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Jerry Koosman's No 36 to be retired by Mets in June
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Mets to Retire Jerry Koosman's Jersey - The New York Times
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Jerry Koosman's No. 36 to be retired
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Mets retiring No. 36 of ex-pitcher Koosman in '20 - ESPN
Jerry Koosman's No 36 to be retired by Mets in June