Roberto Clemente day: Puerto Rican MLB players, Pirates wear No. 21
All Pirates Wearing #21, Rest of MLB Wears Patches in Honour of Roberto Clemente – SportsLogos.Net News
All Puerto Rican Players Can Wear No. 21 On Roberto Clemente Day - CBS Pittsburgh
Roberto Clemente - Wikipedia
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Roberto Clemente day: Puerto Rican MLB players, Pirates wear No. 21
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Pittsburgh Pirates, New York Mets players, coaches to all wear No. 21 on Roberto Clemente Day - ESPN
Puerto Rican Twins don No. 21 in tribute to Roberto Clemente – Twin Cities
Sources: MLB letting more players to wear No. 21 for Clemente Day
Members of Red Sox wear No. 21 with pride on Roberto Clemente Day - The Boston Globe