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Pirates, Mets wear 21 on Roberto Clemente Day
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Roberto Clemente Award - Wikipedia
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Five Astros wear No. 21 on Roberto Clemente Day
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50 years ago: Roberto Clemente dies in plane crash
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MLB expands list of who can wear No. 21 to honor Roberto Clemente on Sept. 15 - ESPN
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A's Joel Payamps gives up pivotal home run in 5-2 loss to Astros
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Carlos Correa's plan for superstardom: 'It's essential I remain the same
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Carlos Correa, a Rookie, Is Already a Leader for the Astros - The New York Times
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Roberto Clemente: Baseball Rebel – Society for American Baseball Research