The document discusses L. Frank Baum's Wizard of Oz series of children's books. It provides context that folktales and fairy tales have long entertained children but that the stories of old contained undesirable elements. Baum wrote The Wonderful Wizard of Oz to provide a modern fairy tale for children that retained wonder but removed heartaches and nightmares. He hoped subsequent Oz books would please children and promised revelations about Oz's magic in his 1919 book. The document lists the many Oz books Baum wrote and their publication dates.