All Puerto Rican players can wear 21 on Clemente Day
Major League Baseball marks Roberto Clemente Day with ceremony at Citi Field - ESPN
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Pirates Memorabilia: Incredible Roberto Clemente Painting Up for Auction – PBN History
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Pittsburgh Pirates - Wikipedia
Roberto Clemente Jr. explains why family of baseball legend is finally ready to part with treasured memorabilia – New York Daily News
How Roberto Clemente Harnessed Celebrity To Change America
Pittsburgh Pirates National Postal Museum
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