As inspired by another thread, my personal Oz headcanon is that only the authentic Baum canon (i.e., Wizard through Glinda), and Hugh Pendexter's "The Three Witches of Oz" are canonical. The latter because it so brilliantly explains an otherwise unexplained inconsistency in the Baum canon itself. Pendexter's other stuff is indeterminate (because I haven't read any of it, and am not even sure where to look for it), and everything else (yes, including Ruth Plumly Thompson's stuff, but especially Maguire's stuff) is bovine scat.

