Puerto Rican Twins don No. 21 in tribute to Roberto Clemente
Twins launch five home runs in beating Cleveland 8-4
Roberto Clemente Shirt
MLB – Roberto Clemente – Pittsburg Pirates – L E's Stories Special – “A 5 Tool Player On The Diamond….And A 5 Star Human Being Off The Field” – Tribute To HOF Legend Roberto Clemente – ImaSportsphile
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Roberto Clemente - Wikiquote
MLB expands list of who can wear No. 21 to honor Roberto Clemente on Sept. 15 - ESPN
Puerto Rican Twins don No. 21 in tribute to Roberto Clemente - InForum
Roberto Clemente Day celebration around MLB
Roberto Clemente remains Latino legend 50 years after death
Roberto Clemente - Wikiquote
Pittsburgh Pirates each don No. 21 to honor Roberto Clemente - ESPN
Retiring Clemente's '21': True Recognition for Latinos in the Majors – Society for American Baseball Research