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American Caramel – SABR's Baseball Cards Research Committee
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21 - Team Issued White Pinstripe Jersey - Roberto Clemente Day - Mets vs. Pirates - 9/15/22 - Mets Win 7-1
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Game-Used Roberto Clemente Day Jersey - Jacob Stallings - PIT vs. CIN - 9/15 /2021
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Why are MLB players wearing 21? Tributes around the league for Pirates legend explained
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MLB Gameday: Reds 4, Pirates 5 Final Score (09/15/2021)
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Team Issued Roberto Clemente Day Blank Jersey - PIT vs. CIN - 9/15/2021
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Joy of a team set, update 18 (putting the '88 Dodgers to bed)
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NYSportsJournalism.com - NY Yankees Sign $220M Partner, Jersey Patch Deal - Yankees Sign $200M Signature Partner, Sleeve Patch Deal With Starr Insurance
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Pittsburgh Pirates each don No. 21 to honor Roberto Clemente - ESPN
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Pittsburgh Pirates, New York Mets players, coaches to all wear No. 21 on Roberto Clemente Day - ESPN
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MLB expands list of who can wear No. 21 to honor Roberto Clemente on Sept. 15 - ESPN
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Yard Goats to Retire Hall of Famer Roberto Clemente #21 at Dunkin' Donuts Park
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PITTSBURGH PIRATES ROBERTO CLEMENTE DAY 21 HAT SGA CAP 9/15/2023
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Roberto Clemente 50th Anniversary
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Game-Used Roberto Clemente Day Jersey - Kyle Crick - PIT vs. CWS - 9/9/2020