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Why are MLB players wearing 21 on their sleeve? - Quora

The Yankees Retire Paul O'Neill's Number 21 - The New York Times

Pirates will honor Roberto Clemente by wearing his No. 21 on their jerseys - ESPN

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MLB allows more players to wear No. 21 to honor Roberto Clemente – NBC Sports Chicago

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Cardinals, Molina homers wearing 21 on Roberto Clemente Day

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