1968 Topps Mets Rookies (Jerry Koosman/Nolan Ryan)
Lot Detail - 1968 Topps Mets Rookies #177 Jerry Koosman/Nolan Ryan Rookie Card - PSA EX-MT 6
1968 Topps #177 Nolan Ryan, Jerry Koosman Rookie Card - SGC VG 3 on Goldin Auctions
1968 Topps #177 Nolan Ryan/Jerry Koosman Rookie Card – BVG NM+ 7.5 on Goldin Auctions
Beckett Grading Services Archives - Page 4 of 6 - Beckett News
Auction Prices Realized Baseball Cards 1968 O-Pee-Chee Mets Rookies J. KOOSMAN/N.RYAN
Nolan Ryan 1968 Topps Rookie Stars #177 Price Guide - Sports Card Investor
Beckett Grading Services Archives - Page 4 of 6 - Beckett News
Lot Detail - 1968 Topps Mets Rookies #177 Jerry Koosman/Nolan Ryan Rookie Card - PSA EX-MT 6
Beckett Grading Services Archives - Page 4 of 6 - Beckett News
Auction Prices Realized Baseball Cards 1968 O-Pee-Chee Mets Rookies J. KOOSMAN/N.RYAN
Beckett Grading Services Archives - Page 4 of 6 - Beckett News
Auction Prices Realized Baseball Cards 1968 O-Pee-Chee Mets Rookies J. KOOSMAN/N.RYAN
Beckett Grading Services Archives - Page 4 of 6 - Beckett News