Roberto Clemente Day: Pirates and Mets wear 21
Roberto Clemente - Wikipedia
Fightins to Retire Roberto Clemente's #21 - BCTV
Pittsburgh Pirates, New York Mets players, coaches to all wear No. 21 on Roberto Clemente Day - ESPN
Altoona Curve honors Pirates legend Roberto Clemente, retires No. 21
Roberto Clemente's death 50 years ago forever changed his son, a former Phillies minor leaguer
Some MLB Players Wearing #21, All Wearing 21 Patches Today for Roberto Clemente Day – SportsLogos.Net News
Fightins to Retire Roberto Clemente's #21
Roberto Clemente recorded 3,000th hit 50 years ago today - Bucs Dugout
Five Astros wear No. 21 on Roberto Clemente Day
For the 'Great One': PittsburghPirates, Major League Baseball honor Roberto Clemente
Curve to retire No. 21, honor Roberto Clemente and family