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1989 Upper Deck Baseball #13 Gary Sheffield Rookie
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1989 Upper Deck Baseball Checklist, Team Set Lists, Top Cards
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MLB, USA Baseball announce 2023 Prospect Development Pipeline
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1997 Denny's: The Most Ambitious Set Ever? – SABR's Baseball Cards
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How Ken Griffey Jr.'s rookie card became No. 1 for Upper Deck - ESPN
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Marc Newfield – Society for American Baseball Research
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Joy of a team set, update 18 (putting the '88 Dodgers to bed)
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1989 Upper Deck Milwaukee Brewers Team Set with Gary
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MLB Gary Sheffield Signed Trading Cards, Collectible Gary
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Uniform number (Major League Baseball) - Wikipedia