Altoona Curve to retire Roberto Clemente's No. 21
Pittsburgh Pirates - Wikipedia
It's time for Roberto Clemente's No. 21 to be retired across baseball - Bucs Dugout
Retiring Clemente's '21': True Recognition for Latinos in the Majors – Society for American Baseball Research
Altoona Curve honors Pirates legend Roberto Clemente, retires No. 21
Living out the legacy: Curve retire No. 21 as reminder of Clemente's greatness
Curve to retire No. 21 in honor of Pirates OF Roberto Clemente on July 21, Sports
Living out the legacy: Curve retire No. 21 as reminder of Clemente's greatness
Curve to retire No. 21, honor Roberto Clemente and family
Retire 21 (@RetireTwentyOne) / X
Altoona Curve to officially retire Roberto Clemente's No. 21 during ceremony Friday
Melanie Heller
TSN Archives: Roberto Clemente Died as He Lived — Caring (Jan. 20, 1973, issue)
Living out the legacy: Curve retire No. 21 as reminder of Clemente's greatness