MLB commemorates 9/11 anniversary with ballpark ceremonies - ESPN
MLB teams to wear Stoneman High School caps
Mike Piazza, Mets honor 9/11 fallen, first responders: 'Part of who we are
Yankees, Mets get green light from MLB to wear first-responder caps on 9/11 anniversary
Mets, Yankess don NYPD, FDNY hats, honor Sept. 11 first responders
MLB finally gives Mets permission to wear NYPD, FDNY hats on anniversary of 9/11
Lawmaker rips MLB for refusing to let Mets wear 9/11 tribute hats
Mets recognize 9/11 20 years later in pregame ceremony
Mets, Yankees, MLB to Mark 9/11 20th Anniversary with On-Uniform Tributes – SportsLogos.Net News
Ex-Met David Wright thrilled to be commish for NYPD-FDNY clash
NY Mets' Pete Alonso customizes teammates' cleats to honor 9/11 victims
9/11 tributes in football, baseball – Orange County Register
Mets recognize 9/11 20 years later in pregame ceremony