MLB celebrates Roberto Clemente Day, ceremony at Citi Field - CBS Pittsburgh
Angels coach Jose Molina puts Roberto Clemente's number on his back – Orange County Register
Should MLB retire Roberto Clemente's jersey number?
50 years after Roberto Clemente's death is time of introspection for Puerto Rican baseball
Should Roberto Clemente's Number 21 be Retired Across all of the MLB?
Altoona Curve honors Pirates legend Roberto Clemente, retires No. 21
MLB's Pirates will honor Roberto Clemente by wearing his number
Pirates walk off on Roberto Clemente Day as push to retire his No. 21 continues
Demilio: Roberto Clemente Day Serves as Another Reminder to Retire No. 21
Pirates will honor Roberto Clemente by wearing his No. 21 on their jerseys - ESPN
Pirates will wear Roberto Clemente No. 21