The Fates of the 22: MLB Umpire Resignations in 1999 – Society for American Baseball Research
Veteran umpire Tim Welke is retiring - NBC Sports
Controversial MLB umpire Joe West announces retirement with record in hand
May 31, 1999: When umpire Frank Pulli spontaneously pioneered MLB replay review and took away a homer
Ten MLB umpires are 'set to retire at the end of the month' - the LARGEST turnover since 1999
Close Call Sports & Umpire Ejection Fantasy League: Jim Reynolds Retires Following 24 Major League Seasons
Yankees' Aaron Boone suspended 1 game by MLB for conduct toward umpires – KGET 17
Ten MLB Umpires Retiring, Most Since 1999
Play Ball! UConn Magazine
Sources - 10 MLB umps retiring, most since '99 - ESPN
Dale, we know you're gay.' How a Major League Baseball umpire came out - Outsports
10 MLB Umpires Retire - Baseball Says Bye to 261 Years of On-Field Major League Umpiring Experience
Meals started in Salem and ended in big leagues