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Mets to Retire Jerry Koosman's Jersey - The New York Times
What Jerry Koosman and Tom Seaver did 50 years ago is unimaginable today – New York Daily News
I'll go over the moon only once
Jerry Koosman's No 36 to be retired by Mets in June
Jerry Koosman- Mets All Time Lefthander (Part Three 1974-1985)
Ultimate Mets Database - Jerry Koosman
Topps & fathers & sons
Jerry Koosman's No. 36 to Be Retired By Mets in June – NBC New York
Joy of a team set, update 18 (putting the '88 Dodgers to bed)