In 1973, new fashion for baseball umpires was strictly a judgment

John Racanelli – SABR's Baseball Cards Research Committee

Baseball / Useful Notes - TV Tropes

Jacob deGrom First to be Inspected by Umpires for Sticky Substances - The New York Times

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Members of '71 champion Pirates recall 'joyous time' 50 years later

Thanks - San Fernando Valley Baseball Umpires Association

Remembering Gene Michael

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MLB analysis: Willie Mays as a New York Met and the 1973 World Series - McCovey Chronicles

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