1999 Fleer Sports Illustrated Greats of the Game Jerry Koosman #17
Hostess Card Of The Week: 1977 Jerry Koosman
So I spoke with a guy who wants 300 grand for a collection The inventory is 94 pages long — Collectors Universe
NY Mets Price List - Supercollector Catalog
NY Mets Price List - Supercollector Catalog
Jerry Koosman Baseball Cards
Nolan Ryan Rookie Card Value: History and Details – Wax Pack Gods
Tribute Sets – Page 2 – SABR's Baseball Cards Research Committee
Developers Renew Fight to Build 161-Unit Vestal Housing Project
1999 Sports Illustrated Greats of the Game
1999 Fleer Greats of the Game Jerry Koosman New York Mets #17
Nolan Ryan Baseball Trading Card Database