The Royal Book of Oz (1921) is the fifteenth in the series of Oz books, and the first, by Ruth Plumly Thompson, to be written after L. Frank Baum's death. Although Baum was credited as the author, it was written entirely by Thompson. Beginning in the 1980s, some editions have correctly credited Thompson, 1] although the cover of the 2001 edition by Dover Publications credits only Baum. The original introduction claimed that the book was based on...