Adaptations of The Wizard of Oz
"The Wonderful Wizard of Oz" is a 1900 children's novel written by American author L. Frank Baum. Since its first publication in 1900, it has been adapted many times: for film, television, theatre, books, comics, games, and other media.Many of the television programs cited in this list are not strict adaptions of "The Wizard of Oz"; rather, they have reinterpreted aspects of the book, such as characters and plot, to create sequels, prequels or side-plots, which are inspired by Baum's original text.
There are over 40 canonical Oz books, including 14 by Baum, all of which are considered "official" sequels or prequels to "The Wonderful Wizard of Oz". In addition, the following books use the Oz milieu as settings for their tales:Kevin Scott Collier. "The Wonderful Animated World of the Wizard of Oz: The Good, The Bad and The Ugly!" CreateSpace Independent Publishing Platform, 2018.
Wizard of Oz experiment
A final point: Dr. Kelley's recollection of the coinage of the term is backed up by that of the late professor Al Chapanis. In their 1985 University of Michigan technical report, Green and Wei-Haas state the following: 
"The first appearance of the "Wizard of Oz" name in print was in Jeff Kelley's thesis (Kelley, 1983a, 1983b, 1984a). It is thought the name was coined in response to a question at a graduate seminar at Hopkins (Chapanis, 1984; Kelley, 1984b). "What happens if the subject sees the experimenter [behind the "curtain" in an adjacent room acting as the computer]?" Kelley answered: "Well, that's just like what happened to Dorothy in the Wizard of Oz." And so the name stuck." (Cited by permission.)