Topps entered baseball card market with first set in 1951
1952 Topps Mickey Mantle Rookie Highlights Complete Vintage Sets
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1956–1968 – Page 2 – SABR's Baseball Cards Research Committee
5 Solid Buys in the 1951 Topps Red and Blue Back Sets
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1951 Bowman Mickey Mantle
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Here's What Collectors Feel is the First Topps Set - The Radicards