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Major League Baseball marks Roberto Clemente Day with ceremony at Citi Field - ESPN
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Five Astros wear No. 21 on Roberto Clemente Day
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Roberto Clemente - Wikipedia
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FOCO Releases Bobbleheads, Embroidered Bear For Roberto Clemente Day
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All Puerto Rican players can wear 21 on Clemente Day
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Clemente Award winners will have 21 on caps for entire MLB career
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Pirates to wear No. 21 on Sept. 9 to honor Roberto Clemente - NBC Sports
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MLB's Pirates will honor Roberto Clemente by wearing his number
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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's Pirates will honor Roberto Clemente by wearing his number
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How Roberto Clemente Jr. wants to honor his dad transcends retiring the iconic Pirate's numbers