Roberto Clemente day: Puerto Rican MLB players, Pirates wear No. 21

Mets, Pirates to Wear No. 21 on Clemente Day - Metsmerized Online

Que Viva Clemente! Roberto Lives On in the Hearts of Latino Major Leaguers – Society for American Baseball Research

Angels coach Jose Molina puts Roberto Clemente's number on his back – Orange County Register

MLB celebrates Roberto Clemente Day

MLB celebrates Roberto Clemente Day, ceremony at Citi Field

Houston Astros: 8 players don No. 21 on Roberto Clemente Day

A Uni Watch Look at MLB's Roberto Clemente Day

ESPN: MLB to allow Pirates, Puerto Rican players, award nominees to wear No. 21 on Roberto Clemente Day

MLB's Pirates will honor Roberto Clemente by wearing his number

For the 'Great One': PittsburghPirates, Major League Baseball honor Roberto Clemente