History – SABR's Baseball Cards Research Committee
80s Baseball - Happy '80s Birthday to Gregg Jefferies, whose rookie card is going to make us all rich.
90 Feet from Home: The Baseball History Forum
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80s Baseball - Happy '80s Birthday to Gregg Jefferies, whose rookie card is going to make us all rich.
Top 15 Most Valuable Baseball Cards from the 1980s
1989 Topps Gregg Jefferies Values - MAVIN
gregg jefferies rookie Values - MAVIN
Top 15 Most Valuable Baseball Cards from the 1980s
Trouble with the Curve, A baseball card hobby blog…