Author: John Butt
Bio: differentiate to
John Anthony Butt, organist, https://openlibrary.org/authors/OL7422893A/John_A._Butt

John Everett Butt, English literary critic https://openlibrary.org/authors/OL147293A/John_Everett_Butt

John Walden Butt, Spanish linguist https://openlibrary.org/authors/OL7422892A

John Butt (1929- ), Scottish industrial archaeologist https://openlibrary.org/authors/OL342815A/John_Butt

Others?