Gregg Jefferies Price List - Supercollector Catalog
Your Turn (Beckett Baseball No. 74): If you could own just one card, what would it be? - Beckett News
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C.A.: 1982 Topps Denny Lewallyn
Gregg Jefferies Baseball Cards
gregg jefferies topps 233 Values - MAVIN
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History – SABR's Baseball Cards Research Committee
1991 SCD Baseball Card Price Guide '71 Topps #27 Gregg Jefferies New York Mets