Lyman Frank Baum

The Royal Book of Oz 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, although the cover of …

The Master Key: An Electrical Fairy Tale, Founded Upon the Mysteries of Electricity and the Optimism of Its Devotees is a 1901 novel by L. Frank Baum, author of The Wonderful Wizard of Oz. It was illustrated by F. Y. Cory.