MLB allows Puerto Rican players to wear No. 21 on Roberto Clemente
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Sources: Puerto Rican MLBers can wear No. 21 - Mountain Top Media
All of MLB's Puerto Rican players can wear No. 21 on Roberto
Puerto Rican players follow Pirates' push to wear No. 21
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Sources: MLB letting more players to wear No. 21 for Clemente Day
All of MLB's Puerto Rican players can wear No. 21 on Roberto