JUST THE HITS - Don Mattingly Rookie Card - 1984 O-Pee-Chee
1984 Donruss Baseball Cards – 10 Most Valuable – Wax Pack Gods
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25 Most Valuable 1984 Topps Baseball Cards - Old Sports Cards
Don Mattingly Price List - Supercollector Catalog
TCMA and SSPC – SABR's Baseball Cards Research Committee
Vintage Breaks New Breaker D20 Pulls 1984 O-Pee-Chee Mattingly Rookie
Don Mattingly Rookie Cards: The Ultimate Collector's Guide - Old
Don Mattingly Price List - Supercollector Catalog
Iconic 1987 Topps set still loved by collectors on 35th
The 1984 Topps Baseball Card Set – Baseball Analytics
Best Don Mattingly Baseball Cards - MoneyMade
Vintage Breaks New Breaker D20 Pulls 1984 O-Pee-Chee Mattingly Rookie
Don Mattingly Rookie Card, Minor League and Other Early Cards Guide
1984 O-Pee-Chee (OPC) #8 Don Mattingly ROOKIE RC PSA 8