Roberto Clemente 1971 World Series Game Used Cap

Altoona Curve honors Pirates legend Roberto Clemente, retires No. 21

ESPN: MLB to allow Pirates, Puerto Rican players, award nominees to wear No. 21 on Roberto Clemente Day

Remembering the life and legacy of #21 on Roberto Clemente Day

Roberto Clemente Jr. explains why family of baseball legend is finally ready to part with treasured memorabilia – New York Daily News

Roberto Clemente, Latinos honored at Reading Fightin Phils – Reading Eagle

1971 WORLD SERIES Plus: Roberto Clemente “A Touch Of Royalty” on DVD! : Movies & TV

Ranking every World Series in MLB history - ESPN

1972 Roberto Clemente Spring Training Game Used Hat (J.T. Sports & Herrera LOA), Sotheby's & Goldin Auctions Present: A Century of Champions, 2020

American Experience, Roberto Clemente, Season 20, Episode 7