The Worst Witch
"The Worst Witch" () was first published in 1974 by Allison & Busby, who took the book on after it had been turned down by three other publishers.
Andre Norton
She wrote more than a dozen speculative fiction series, but her longest, and longest-running project was "Witch World", which began with the novel "Witch World" in 1963. The first six novels were Ace Books paperback originals published from 1963 to 1968. From the 1970s most of the series was published in hardcover editions. From the 1980s some were written by Norton and a co-author, and others were anthologies of short fiction for which she was editor. (Witch World became a shared universe). There were dozens of books in all.