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I just was given hundreds of baseball cards from the 1980s and 1990s. What are the most valuable cards from the 1980s to 1990s? - Quora
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Mike Schmidt Trading Cards: Values, Tracking & Hot Deals
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Baseball Card Auction (Shawnee)
1988 Topps Baseball Cards – 25 Most Valuable … Plus BONUS Listings! – Wax Pack Gods