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Which Oz book was published after L. Frank Baum’s death?

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Illustration by W.W. Denslow showing Dorothy comforting the Cowardly Lion on a yellow brick road, with Toto, the Tin Woodsman, and the Scarecrow nearby in a forest. — The Wonderful Wizard of Oz An illustrated page by W.W. Denslow in L. Frank Baum's *The Wonderful Wizard of Oz*.

The Oz book published after L. Frank Baum’s death is Glinda of Oz, which appeared in 1920. Baum died in 1919, and while he wrote 13 books in the series following The Wonderful Wizard of Oz, the series was continued by other writers after his passing.12