The First Book (3 in 1 Book): 1. The Wonderful Wizard of Oz 2. The Marvelous Land of Oz 3. Ozma of Oz The Second Book (3 in 1 Book): 1. The Patchwork Girl of Oz 2. Tik-Tok of Oz 3. The Scarecrow of Oz The Third Book (3 in 1 Book): 1. The Emerald City of Oz 2. The Road to Oz 3. Dorothy and the Wizard in Oz The Fourth Book (3 in 1 Book): 1. Rinkitink in Oz 2. The Tin Woodman of Oz 3. The Lost Princess of Oz The Fifth Book (3 in 1 Book): 1. The Magic of Oz 2. Glinda of Oz 3. The Royal Book of Oz

[Source: Wilco]