NY Mets to retire Jerry Koosman's number next season, Jeff Wilpon says
Jerry Koosman: All Time Mets Left Handed Pitcher (Part Two-1973-1978)
NY Mets to retire Jerry Koosman's number next season, Jeff Wilpon says
Jerry Koosman – Society for American Baseball Research
Jerry Koosman's No. 36 to Be Retired By Mets in June – NBC New York
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NY Mets to retire pitcher Jerry Koosman's number next season
Mets Will Retire Jerry Koosman's Number On June 13 - Metsmerized Online