A Uni Watch Look at MLB's Roberto Clemente Day
Uniform number (Major League Baseball) - Wikipedia
MLB's Pirates will honor Roberto Clemente by wearing his number
Report: Puerto Rican MLB Players Allowed to Wear No. 21 on Roberto Clemente Day, News, Scores, Highlights, Stats, and Rumors
Roberto Clemente – The Cardinal
MLB Celebrates Roberto Clemente Day
Some MLB Players Wearing #21, All Wearing 21 Patches Today for Roberto Clemente Day – SportsLogos.Net News
For the 'Great One'; Pirates, MLB honor Roberto Clemente - The San Diego Union-Tribune
Roberto Remembered
Puerto Rican Twins don No. 21 in tribute to Roberto Clemente – Twin Cities
Que Viva Clemente! Roberto Lives On in the Hearts of Latino Major Leaguers – Society for American Baseball Research
Puerto Rican players follow Pirates' push to wear No. 21, celebrate Roberto Clemente