Campaign To Retire Roberto Clemente's No. 21 Throughout MLB Gains Traction
Roberto Clemente exhibit to open in Puerto Rico Feb. 21 –
Sports in Courts: Roberto Clemente v. Pittsburgh Weekly Sports, et al. – The Text Message
Petition 21 millions signatures to retire MLB #21
Fightins to Retire Roberto Clemente's #21
Roberto Clemente's death 50 years ago forever changed his son, a former Phillies minor leaguer
Retire Twenty One
Clemente's #21 will not be retired across MLB despite report
Pirates will honor Roberto Clemente by wearing his No. 21 on their jerseys - ESPN
MLB Officially Announces Sept. 15 As Roberto Clemente Day – The Impact