Pittsburgh Pirates to wear No. 21 on Sept. 9 to honor Roberto Clemente
Members of Red Sox wear No. 21 with pride on Roberto Clemente Day - The Boston Globe
Roberto Clemente Day: Pirates and Mets wear 21
Pirates And MLB To Celebrate Roberto Clemente Day, WESB B107.5-FM/1490-AM
Yankees rally for 4 runs after throwing error in 9th, beat Pirates
Roberto Clemente's Puerto Rico Winter League Career, Part I – Society for American Baseball Research
Roberto Clemente's World Series Home Uniform – Robb Report
MLB celebrates Roberto Clemente Day, ceremony at Citi Field
Ron Cook: Pirates are giving Roberto Clemente a fitting tribute
Yankees rally in the ninth to slip past the Pirates on Roberto Clemente Day - CBS Pittsburgh
MLB's Pirates will honor Roberto Clemente by wearing his number
MLB celebrates Roberto Clemente Day, ceremony at Citi Field