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After Jackie Robinson, MLB integration was halting - The Washington Post
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Cardinals, Molina homers wearing 21 on Roberto Clemente Day
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MLB Let Players Pick a Crazy Nickname to Wear. Their Choices Were Dull. - WSJ
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MLB Clemente Award winners wear his 21 on caps for careers
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Uniform number (Major League Baseball) - Wikipedia
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Roberto Clemente Day celebrated around MLB in 2023
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Several Cardinal players are now have 21 on their caps
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MLB celebrates Roberto Clemente Day
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Houston Astros: 8 players don No. 21 on Roberto Clemente Day
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Report: Puerto Rican MLB Players Allowed to Wear No. 21 on Roberto Clemente Day, News, Scores, Highlights, Stats, and Rumors
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Why are MLB players wearing 21 on their sleeve? - Quora
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New generation takes over Coors Field All-Star Game at time when baseball needs it most: What a bonanza for the game
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Baseball Celebrates Clemente with “21” Patches; Pirates and Award Winners All Wearing #21 – SportsLogos.Net News
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MLB celebrates Jackie Robinson, calls for justice continue
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MLB's Puerto Rican-born players honor Roberto Clemente by wearing 21