2019 Minor League Baseball Umpire Manual by Dusty Dellinger, Tom Honec, Jorge Bauza - Audiobook
2020 Oakland A's Media Guide, PDF, Major League Baseball
The Official 2018-2019 MiLB Umpire Uniform, Blog
The Official 2020-2021 MiLB Umpire Uniform, Blog
Smitteez Blog – The Ultimate Place For Umpires & Referees to Exchange Chatter
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What is the difference between recreational (Official league) and official ( official major league) baseballs? What is the best ball to use for fun to shag and hit some homers? - Quora
MLB umpires may get on-field microphones to explain replay review outcomes - Bless You Boys
The Official 2018-2019 MiLB Umpire Uniform, Blog
2019 MiLB All-Star Game Assignments, Blog
Umpire (baseball) - Wikipedia
How to make the MLB with hard work, but no organized baseball experience - Quora