MLB makes history by naming its first black and Latino-born umpire

Baseball 101: Noteworthy debuts - Newsday

TIL Ron Luciano, a popular and eccentric major league umpire from 1969-1979, refused to call balks. I never called a balk in my life. I didn't understand the rule. : r/baseball

MLB appoints 1st black umpire crew chief

Minnie Miñoso, MLB's first Black Latino star, was a baseball pioneer

Whittier College forms institute for baseball studies – Whittier Daily News

Documentary celebrates life of NL's first Black umpire, Bakersfield's Art Williams

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MLB umpire retirements, promotions

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Baseball's All-Time Mexican-Born Team - Vintage Detroit Collection

History of Umpiring 8

MLB makes history by naming its first black and Latino-born umpire crew chiefs

MLB makes history by naming its first black and Latino-born umpire crew chiefs

Minnie Miñoso, MLB's first Black Latino star, was a baseball pioneer

Alfonso Márquez - Wikipedia