MLB should retire Roberto Clemente's No. 21
Roberto Clemente as influential as ever 50 years after death - Los Angeles Times
Hall of Fame baseball player Roberto Clemente honored in new Paley Center for Media exhibit - CBS New York
Ríos, Hernández to wear uniform No. 21 on Roberto Clemente Day, by Rowan Kavner
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Curve to retire No. 21 in honor of Pirates OF Roberto Clemente on July 21, Sports
SF Giants' Ortiz, García to wear No. 21 on Roberto Clemente Day
MLB - Today, we remember Roberto Clemente, a great
A's Vimael Machin 'honored' to wear No. 21 on Roberto Clemente Day
No, we do not need to retire Roberto Clemente's number across baseball - NBC Sports
Uniform number (Major League Baseball) - Wikipedia
On Roberto Clemente Day, William Contreras Was Great - Brewers - Brewer Fanatic
Nats DH Cruz, other Clemente Award winners wear '21' on caps
MLB's Puerto Rican-born players honor Roberto Clemente by wearing 21
Some MLB Players Wearing #21, All Wearing 21 Patches Today for Roberto Clemente Day – SportsLogos.Net News