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Honoring Keith Hernandez's No. 17 jersey retirement with 17 stories of the Mets lifer - The Athletic
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Jerry Koosman Baseball Stats by Baseball Almanac
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Charitybuzz: 1969 Mets World Series Champs Signed Memorabilia
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Heroes of '69: Jerry Koosman Lived For The Big Games - Metsmerized Online
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Jerry Koosman MLB Original Autographed Items for sale
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Memorabilia Ultimate Team Set
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Jerry Koosman Autographed Jersey - Mets History
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Remembering Mets History (1973) Jerry Koosman Shuts Out the Giants for Ten Innings In a 1-0 Win
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Jerry Koosman Trades and Transactions by Baseball Almanac
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Jerry Koosman Autographed Jersey - Mets History
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This Day in NY Mets History: Jerry Koosman makes his MLB debut against the Phillies
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Jerry Koosman Archives - Page 2 of 3 - Mets History
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Sold at Auction: 1969 Mets 16x20 Photo Signed By (16) With Jerry Koosman, Bud Harrelson, Ed Kranepool (JPRS Hologram)
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Mets COTW: 1979 Topps Jerry Koosman – Mets360
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1969 New York Mets team autographed baseball bat