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Yankees help pay tribute to former Pirates great Roberto Clemente - Newsday
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Best Pirates players by uniform number
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50 Years Later, the Pirates' Lineup of Color Still Resonates - The New York Times
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Baseball celebrates Roberto Clemente Day to honour Puerto Rican legend - World Baseball Softball Confederation
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Pittsburgh Pirates to wear No. 21 on Roberto Clemente Day
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MLB Celebrates Roberto Clemente Day
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MLB celebrates former Pirates great Roberto Clemente Day
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Why are MLB players wearing 21? Tributes around the league for Pirates legend explained
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Nats DH Cruz, other Clemente Award winners wear '21' on caps
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For the 'Great One'; Pirates, MLB honor Roberto Clemente