Altoona Curve honors Pirates legend Roberto Clemente, retires No. 21
The Clemente Museum
Remembering Roberto Clemente - Pittsburgh Quarterly
Roberto Clemente's legacy celebrated in N.Y., Puerto Rico
Roberto Clemente's legacy celebrated in N.Y., Puerto Rico
Roberto Clemente: The Great One - Cooperstown Cred
MLB celebrates Roberto Clemente Day, ceremony at Citi Field - The San Diego Union-Tribune
Curve to retire No. 21 in honor of Pirates OF Roberto Clemente on July 21, Sports
Roberto Clemente: More than Latin America's baseball star
Altoona Curve honors Pirates legend Roberto Clemente, retires No. 21