Should Roberto Clemente's #21 Be Universally Retired Across MLB?
Campaign To Retire Roberto Clemente's No. 21 Throughout MLB Gains Traction
List of Major League Baseball retired numbers - Wikipedia
For Many Latino Players, Roberto Clemente's Number Is Off Limits, Too - The New York Times
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Should Roberto Clemente's number be retired leaguewide?
Clemente's #21 will not be retired across MLB despite report
Should Roberto Clemente's Number 21 be Retired Across all of the MLB?
Some MLB Players Wearing #21, All Wearing 21 Patches Today for Roberto Clemente Day – SportsLogos.Net News
For Many Latino Players, Roberto Clemente's Number Is Off Limits, Too - The New York Times
Roberto Clemente Deserves His Number 21 to be Retired Across the MLB - Last Word on Sports
Petition · Retire Roberto Clemente's Number 21 from Major League Baseball ·
When King died, Major League Baseball struck out
OTL: The enduring mystery of Roberto Clemente's bat - ESPN
