Puerto Rican players pushing for MLB to retire Clemente's number
MLB celebrates Roberto Clemente Day, ceremony at Citi Field
Dodgers' Kiké Hernández honors Roberto Clemente after homer - Los Angeles Times
Roberto Clemente's legacy celebrated in N.Y., Puerto Rico
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September 30, 1972: Roberto Clemente collects 3,000th career hit in final at-bat – Society for American Baseball Research
Rich tradition of retired numbers part of game's legacy
Roberto Clemente Day: Pirates and Mets wear 21
Puerto Rican players follow Pirates' push to wear No. 21, celebrate Roberto Clemente
MLB expands list of who can wear No. 21 to honor Roberto Clemente on Sept. 15 - ESPN
ESPN: MLB to allow Pirates, Puerto Rican players, award nominees to wear No. 21 on Roberto Clemente Day
Campaign To Retire Roberto Clemente's No. 21 Throughout MLB Gains Traction
Demilio: Roberto Clemente Day Serves as Another Reminder to Retire No. 21
Giants coach Nick Ortiz campaigns for universally retiring Clemente's 21
Baseball in Clemente's Puerto Rico – a Dream Fulfilled - Pittsburgh Quarterly
It's Time for MLB to Do More to Celebrate Roberto Clemente
MLB celebrates former Pirates great Roberto Clemente Day
