MLB advertising on umpire's uniforms has takena very dark turn - Free For All - Umpire-Empire
Ken Kaiser, Colorful and Imposing Big League Umpire, Dies at 72 - The New York Times
Very New Umpire - Umpire Equipment - Umpire-Empire
Cardinals' Alec Burleson laments eighth-inning at-bat altered by umpire's calls
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Let the Kids Play: Latino Players, Differing Play Styles and Racial Stigma in Major League Baseball - Andrew Mitchel, Jeffrey H. Cohen, 2023
What is the device that umpires have in their hands and look into after a caught behind appeal/nick? - Quora
MLB advertising on umpire's uniforms has takena very dark turn - Free For All - Umpire-Empire
With MLB instant replay rule, announcers and umpires on the spot – New York Daily News
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The ESPN Daily podcast -- How to listen, episode guide and more - ESPN
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