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Number (sports) - Wikipedia
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Mariners ditching gray road jerseys because of new MLB rules
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What Pros Wear: Top 10 Throwback MLB Jerseys - What Pros Wear
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The Coolest Throwback Jersey to Own for Each MLB Team, News, Scores, Highlights, Stats, and Rumors
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What Pros Wear: Top 10 Throwback MLB Jerseys - What Pros Wear
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Uni Watch - The best throwback uniform for each MLB team - ESPN
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Every uniform number ever, ranked by value
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Baseball Celebrates Clemente with “21” Patches; Pirates and Award Winners All Wearing #21 – SportsLogos.Net News