Following Baum's death, publisher
Reilly & Lee continued publishing annual
Oz books, selecting new Royal Historians to record the latest Oz doings. These books, together with Baum's original fourteen novels, form the "Famous Forty", and are considered the canonical books of the series. Ruth Plumly Thompson's style was markedly different from Baum's. Her tales harked back to more traditional
fairy tales. She often included a small kingdom, with a prince or princess who saves his or her kingdom and regains the throne or saves Oz from invasion.
Books by Ruth Plumly Thompson Thompson wrote two additional novels in the 1970s which are not included in the "Famous Forty":
Yankee in Oz (1972) and
The Enchanted Island of Oz (1976), both
published by the International Wizard of Oz Club.
Books by John R. Neill Illustrator John R. Neill's vision of Oz is more manic than Thompson or Baum's. Houses often get up and do battle, and everything can be alive. His entries take Oz's color scheme (blue for
Munchkin Country, red for
Quadling Country, etc.) to an extreme, extending it to sky and skin colors.
Books by Jack Snow Jack Snow was a Baum scholar, and even offered to take over the series at age twelve when Baum died. Snow's books lack any characters created by Thompson or Neill, although he did create his own.
Book by Rachel Cosgrove Payes Book by Eloise Jarvis McGraw and Lauren Lynn McGraw ==Additional books==