Standard Catalog of Minor League Baseball Cards: The Most Comprehensive Price Guide Ever Published [Book]

Collectors can trace the early careers of Major League stars from 1880 to present in the only source for card quantities and rare issues. Prices are available in three grades and a special section lists all minor league cards for 50 of today's top major league stars.

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This is not mtg related - but more as a perspective from another TCG Pokémon - was pretty surprise at the price of the “11 most expensive Pokémon cards ever” : r/mtgfinance

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