Question: What book reunites Dorothy with the humbug Wizard from "The Wonderful Wizard of Oz" (1900), and had one of the earliest film adaptations?
Sentence (from "Dorothy and the Wizard in Oz"): This is one of only two of the original fourteen Oz books (the other being "The Emerald City of Oz" (1910), to be illustrated with watercolor paintings.
Relevant evidence: No