To Pirates catcher Michael Perez, wearing No. 21 'very special
Puerto Rican players follow Pirates' push to wear No. 21, celebrate Roberto Clemente
When King died, Major League Baseball struck out
It's going to be unbelievable': Pirates psyched to honor Roberto Clemente by donning No. 21 next week
1967 Pittsburgh Pirate Team Issue Roberto Clemente #21 (Yellow Cap), Lot #52031
Roberto Clemente, Pittsburgh's Hero
Celebrating Roberto Clemente day : r/baseball
Roberto Clemente Jr. explains why family of baseball legend is finally ready to part with treasured memorabilia – New York Daily News
Roberto Clemente day: Puerto Rican MLB players, Pirates wear No. 21
MLB celebrates Roberto Clemente Day, ceremony at Citi Field
Pirates will honor Roberto Clemente by wearing his No. 21 on their jerseys - ESPN
It's going to be unbelievable': Pirates psyched to honor Roberto Clemente by donning No. 21 next week