Core Four - Wikipedia
Posada Drops to Ninth, Then Out of Yankees' Lineup - The New York Times
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Watch the Yankees' 'Core Four' reunite before Derek Jeter's last home opener
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2022 Summer Baseball Titles: Paul O'Neill, Jackie Robinson, Rebels and Keeping Score
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Jorge Posada, Mariano Rivera on Derek Jeter being last of Core Four
ANdy Pettitte, Mariano Rivera, Jorge Posada and Derek Jeter 5 time world series champions the core four New York Yankees shirt, hoodie, sweater, long sleeve and tank top
Yankees captain Derek Jeter to retire after 2014 season
The Cour Four: Yankee legends have roundtable lunch discussion - Sports Illustrated Vault
Yankees better than you think
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Does Jorge Posada Deserve a Closer Look for the Hall of Fame? - Cooperstown Cred