For Many Latino Players, Roberto Clemente's Number Is Off Limits
Remembering the Life and Legacy of Roberto Clemente
Pirates to wear No. 21 on Sept. 9 to honor Roberto Clemente
Roberto Clemente's No. 21 is 'retired in our hearts' but not on most MLB rosters - The Athletic
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Roberto Clemente, Not Just a Baseball Player but a Hero – 9 Inning Know It All
Roberto Clemente honors pirates star
Cruz wins MLB's Roberto Clemente Award for philanthropy
For Many Latino Players, Roberto Clemente's Number Is Off Limits, Too - The New York Times
Book Roberto Clemente Jr. for Speaking, Events and Appearances
Roberto Clemente, Juan Marichal and the Latin American stars who changed baseball - Sports Illustrated Vault
American Experience, Roberto Clemente, Season 20, Episode 7
Roberto Clemente and the magic of No. 21 - MLB - ESPN