21 things you should know on Roberto Clemente Day
Pirates, MLB honour 'the Great One' Roberto Clemente
Roberto Clemente - Wikipedia
For the 'Great One'; Pirates, MLB honor Roberto Clemente
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21 things you should know on Roberto Clemente Day
21 fascinating facts about Roberto Clemente
Pittsburgh Pirates each don No. 21 to honor Roberto Clemente - ESPN
For the 'Great One'; Pirates, MLB honor Roberto Clemente – KXAN Austin
Sources: MLB letting more players to wear No. 21 for Clemente Day
MLB celebrates Roberto Clemente Day as players wear No. 21, call for number to be retired
