1990 Topps Baseball Checklist, Set Info, Boxes, Reviews, More
1989 Topps Baseball Checklist, Set Info, Key Cards, Boxes, More
Auction Prices Realized Baseball Cards 1989 Topps Gregg Jefferies
1990 Topps Baseball Card Checklist
1989 Topps #233 Gregg Jefferies (FUTURE STAR)
1989 Donruss Baseball Checklist, Set Info, Boxes, More
1969–1980 – Page 2 – SABR's Baseball Cards Research Committee
1995 Stadium Club
1995 DonRuss Baseball Sports Trading Cards AA21-1458 – Angels Auction
1989 Topps Gregg Jefferies Values - MAVIN
Gregg Jefferies Baseball Cards
(2) 1989 Topps GREGG JEFFERIES Header Gap Variation