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It's going to be unbelievable': Pirates psyched to honor Roberto Clemente by donning No. 21 next week | Pittsburgh Post-Gazette
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Pittsburgh Pirates, New York Mets players, coaches to all wear No. 21 on Roberto Clemente Day - ABC7 New York
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All Pirates Wearing #21, Rest of MLB Wears Patches in Honour of Roberto Clemente – SportsLogos.Net News
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Amazon.com: 2015 Topps Update Rarities #R-5 Roberto Clemente Pirates Baseball Card NM-MT : Collectibles & Fine Art
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The Team That Changed Baseball: Roberto Clemente and the 1971 Pittsburgh Pirates: Markusen, Bruce: 9781594160899: Amazon.com: Books
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July 25, 1956: Roberto Clemente hits an inside-the-park, walk-off grand slam to lift Pirates – Society for American Baseball Research
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October 1, 1967: Roberto Clemente 'manages' Pirates in season finale and wins fourth NL batting crown – Society for American Baseball Research
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