15 Books in 1: L. Frank Baum's Original "Oz" Series. The Wonderful Wizard of Oz, The Marvelous Land of Oz, Ozma of Oz, Dorothy and the Wizard in Oz, The Road to Oz, The Emerald City of Oz, The Patchwork Girl Of Oz, Little Wizard Stories of Oz, Tik-Tok of Oz, The Scarecrow Of Oz, Rinkitink In Oz, The Lost Princess Of Oz, The Tin Woodman Of Oz, The Magic of Oz, and Glinda Of Oz.