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Mark McGwire's 70th home run ball is worth way less than $3 million
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Mark McGwire - Wikipedia
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Mark McGwire - Oakland Athletics First Base
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The Fall of Mark McGwire: A Tragedy in 3 Acts
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Future major league manager? For Mark McGwire, being around
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Mark McGwire PSA AutographFacts℠
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Mason McGwire, son of former St. Louis Cardinals slugger Mark
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Hall of Fame Poll: Mark McGwire - Bluebird Banter
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Mark McGwire Stats & Facts - This Day In Baseball