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Mets to Retire Jerry Koosman's Jersey - The New York Times
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Mets by the Numbers: Alonso Passes Hernandez - Metsmerized Online
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Mets' retired numbers
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Jerry Koosman to Have Number Retired on August 28, 2021 - Metsmerized Online
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Mets Retired Numbers
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Retired Number Is Latest Mets Head-Scratcher
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Mets to Retire Jerry Koosman's Jersey - The New York Times
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MMO Exclusive: Former Mets Ace, Al Leiter - Metsmerized Online
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Best Mets baseball cards
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Jerry Koosman - Mets History
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Jerry Koosman to Have Number Retired on August 28, 2021 - Metsmerized Online