Core Four - Wikipedia
The Cour Four: Yankee legends have roundtable lunch discussion - Sports Illustrated Vault
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Mariano Rivera, Derek Jeter, Jorge Posada, Andy Pettitte Signed, Framed The Core Four Photograph - 32 x 28 - MLB Authenticated, Steiner on Goldin Auctions
Yankees' legendary Core Four of Derek Jeter, Mariano Rivera, Jorge Posada and Andy Pettitte watches back-to-back home runs from rookies Tyler Austin and Aaron Judge - ESPN
Yankees add member of legendary Core Four as advisor
The βCore Fourβ
Derek Jeter Mariano Rivera Pettitte Posada Core Four Signed Baseball Fanatics
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