MLB Ballplayers Can Now Wear #21 Patch on Ballcaps and Helmets – SportsLogos.Net News
MLB expands list of who can wear No. 21 to honor Roberto Clemente on Sept. 15 - ESPN
Houston Astros: 8 players don No. 21 on Roberto Clemente Day
Pirates wear No. 21 to honor Roberto Clemente
The Athletic] The Yankees have asked MLB if they can stop issuing uniform numbers to their manager and coaches because they're running out of numbers that aren't retired : r/baseball
Pittsburgh Pirates added a new photo. - Pittsburgh Pirates
Nats DH Cruz, other Clemente Award winners wear '21' on caps
All Pirates Wearing #21, Rest of MLB Wears Patches in Honour of Roberto Clemente – SportsLogos.Net News
Baseball Celebrates Clemente with “21” Patches; Pirates and Award Winners All Wearing #21 – SportsLogos.Net News
Pirates wear No. 21 to honor Roberto Clemente
Pittsburgh Pirates, New York Mets players, coaches to all wear No. 21 on Roberto Clemente Day - ESPN