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.
The Witches of Karres
"The Witches of Karres" was originally a novelette published in the December 1949 issue of "Astounding Science Fiction", and has been reprinted many times. The novelette version was included in "The Science Fiction Hall of Fame, Volume Two" as one of the best works published prior to 1966. Schmitz expanded the novelette into a novel in 1966, and it was reissued by Baen Books in 2005.