WHEN TOPPS HAD (BASE)BALLS!: TRADED- 1979 JERRY KOOSMAN

Cardboard Gods Voice of the Mathematically Eliminated

Nolan Ryan Baseball Cards: The Ultimate Collector's Guide - Old Sports Cards

Jerry Koosman: All Time Mets Left Handed Pitcher (Part One: 1967-1972)

9 of the Most Valuable Baseball Cards in History

Jerry Koosman Cards Trading Card Database

Cards are in great condition.

BOTH CARDS! 1977 & 1979 Topps Cards # 300/655 JERRY KOOSMAN NEW YORK METS

1970 Topps #610 Jerry Koosman Mets 4 - VG/EX B70T 09 4504

Society for American Baseball Research

Jerry Koosman interview

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