10 Major League Baseball umpires retire in historic exodus
Baseball Umpires in 1921 – Society for American Baseball Research
One of game's characters, Guardians manager Terry Francona set to end career defined by class, touch, Pro Sports
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2011 Major League Baseball All-Star Game - Wikipedia
MLB Rumors: Ted Barrett & Greg Gibson Among 10 Umpires Retiring
MLB Twitter reacts to mass retirement of major league umpires: Don't let the door hit you on the way out, Wish Angel Hernandez was on this list
Giants' Alou brothers outfield made history. It almost didn't happen
Roberto Ortiz makes MLB umpire history as league replaces Joe West, other retirees
Gread McKinnis – Society for American Baseball Research
Ten MLB Umpires Set To Retire Ahead Of The 2023 Season
Indians rout Cubs in historic World Series opener
MLB umpire retirements, promotions
Sources - 10 MLB umps retiring, most since '99 - ESPN
Longtime MLB umpire, Minot native Gary Cederstrom to retire