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Coronavirus: Inside MLB's long history of dealing with illness - Sports Illustrated
Umpire (baseball) - Wikipedia
Dale Scott, first openly gay MLB umpire, retires - Outsports
The Secret Lives of 8 Baseball Umpires | Mental Floss
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Baseball Is Back, but How Does an Umpire Social Distance at Home Plate? | Vanity Fair
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January 26, 1919: The Flu Mask Baseball Game – Society for American Baseball Research
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NFL assembles all-Black officiating crew for first time
Augmented Reality Umpiring: The Future Of Balls And Strikes? | Fish On The Farm
Baseball Is Back, but How Does an Umpire Social Distance at Home Plate? | Vanity Fair
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Only in 2020: MLB Umpire Pulls Out Mask for Argument With Pirates Manager | News Break
NFL warns not to approach referees without masks on
MLB: Pirates manager, ump calmly put on masks before arguing ejection
January 26, 1919: The Flu Mask Baseball Game – Society for American Baseball Research