All Pirates Wearing #21, Rest of MLB Wears Patches in Honour of Roberto Clemente – SportsLogos.Net News
Pirates, Mets honor Roberto Clemente's legacy in MLB celebration
Roberto Clemente Day to Be Held Throughout MLB on Thursday – NBC 6 South Florida
Houston Astros: 8 players don No. 21 on Roberto Clemente Day
Daily Sports Smile: 50 years after Roberto Clemente's death, MLB honors No. 21
Pirates to wear No. 21 on Sept. 9 to honor Roberto Clemente - NBC Sports
Pirates to wear No. 21 on Sept. 9 to honor Roberto Clemente
Cubs' Javier Baez honored to wear No. 21 on Roberto Clemente Day
MLB gets it right with Roberto Clemente No. 21 jersey policy
Report: MLB allowing more players to wear No. 21 on Roberto Clemente Day
Roberto Clemente - Wikipedia
Five Astros wear No. 21 on Roberto Clemente Day