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

October 1, 1967: Roberto Clemente 'manages' Pirates in season finale and wins fourth NL batting crown – Society for American Baseball Research

How Puerto Rican Baseball Icon Roberto Clemente Left a Legacy Off the Field

Report: Puerto Rican MLB Players Allowed to Wear No. 21 on Roberto Clemente Day, News, Scores, Highlights, Stats, and Rumors

Carlos Correa, a Rookie, Is Already a Leader for the Astros - The New York Times

For Many Latino Players, Roberto Clemente's Number Is Off Limits, Too - The New York Times

Roberto Clemente: Baseball Rebel – Society for American Baseball Research

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

Athletics, Astros celebrate Roberto Clemente Day

Pirates, MLB honour 'the Great One' Roberto Clemente

Kyle Gibson earns third Roberto Clemente Award nomination

Roberto Clemente – Society for American Baseball Research

NYSportsJournalism.com - MLB Accolades Commemorate Roberto Clemente Day - On Roberto Clemente Day, MLB Will Honor 50th Anniversary Of His Passing

Pirates will wear Roberto Clemente No. 21

Happy Roberto Clemente Day! One of the best things MLB does in my opinion. : r/baseball

Witt, Velázquez and Massey each homer for KC Royals in victory over Houston Astros