Do AL and NL MLB umpires wear a patch on their hats for their league? - Quora

Umpires to Wear JM, EC Patches in 2019 World Series – SportsLogos.Net News

Do MLB players get new hats every game? - Quora

MLB, umpires agree on deal that would allow for computerized ball-strike system – The Denver Post

FTX Bankruptcy: Sports Impact Stretches from Tom Brady to MLB –

Do AL and NL MLB umpires wear a patch on their hats for their league? - Quora

Can an MLB umpire really tell where the ball crosses the plate without taking into account where the catcher's glove is when he catches it? - Quora

I'm a new umpire. What do I need to know about umpire equipment/uniform? - Quora

Umpires in Dodgers-Giants game wear Pride hats, a first for pro sports - Outsports

Do AL and NL MLB umpires wear a patch on their hats for their league? - Quora

World Series ump crew youngest in years, nod to K-zone tech

Do AL and NL MLB umpires wear a patch on their hats for their league? - Quora

How do baseball players view professional umpires? Do they see them as professionals dedicated to upholding the rules of the sport, or as biased, non-athletic observers? - Quora

Why are there still umpires in Major League Baseball? Why can't it all be automated? - Quora

Marlborough's Jim Reynolds calls it a career after 24 years as an MLB umpire - The Boston Globe

What is the strike zone in MLB? Why does it change from umpire to umpire? - Quora