Umpire Program
Tips and Tactics for Recruiting New Volunteer Little League® Umpires - Little League
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Robot umpire: Baseball edges closer to implementing automatic strike zone in major leagues
Umpires U.S. POLO ASSN. (en-US)
Umpires U.S. POLO ASSN. (en-US)
Some 10 umpires reportedly to opt out of shortened MLB season - The Boston Globe
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