Question: The Nine Tiny Piglets first appear in the fourth book set in the Land of Oz, written by L. Frank Baum, and illustrated by who?
Sentence (from "The Royal Book of Oz"): Baum's surviving notes, known as "An Oz Book" are known from four typewritten pages found at his publisher's, but their authenticity as Baum's work has been disputed.
Relevant evidence: No