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In page The Royal Book of Oz:
"The original introduction claimed that the book was based on notes by Baum, but this claim has been contested and disproven.[1] The notes, titled "An Oz Book",[2] are known from four typewritten pages found at his publisher's, but their authenticity as Baum's work has been disputed. Even if genuine, they are tied to John Dough and the Cherub and bear no resemblance to Thompson's book.[citation needed]
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