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It's time for Roberto Clemente's No. 21 to be retired across
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Best Pirates players by uniform number
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Roberto Clemente – Wikipedia
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Roberto Clemente Day: Brent Suter celebrates MLB legend, wears No. 21
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Building Nations of Good - Roberto Clemente Foundation
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Pirates' Gregory Polanco on Roberto Clemente: 'He's our Jackie
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MLB Hall of Fame History: Roberto Clemente First Hispanic Player
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Roberto Clemente: More than Latin America's baseball star
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Roberto Clemente, Not Just a Baseball Player but a Hero – 9 Inning
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Pittsburgh Pirates to wear No. 21 on Roberto Clemente Day