New York Mets retire Koosman's No. 36 - Taipei Times
Mets retire Willie Mays' No. 24 as Old-Timers' Day returns
NY Mets to retire pitcher Jerry Koosman's number next season
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Mets to Retire Jerry Koosman's Jersey - The New York Times
Mets will retire Jerry Koosman's number in 2020 – New York Daily News
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NY Mets All-Time Team: Tom Seaver and Jerry Koosman take the mound
Mets retire Willie Mays' No. 24 as Old-Timers' Day returns - CBS
Mets honor Jerry Koosman with overdue jersey retirement
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Mets To Retire Jerry Koosman's No. 36 In 2020 - Metsmerized Online
What Jerry Koosman and Tom Seaver did 50 years ago is unimaginable