11 books • 18 series
Book #1: The Wonderful Wizard of Oz
Book #17: The Wonderful Wizard of Oz
Book #2: The Marvelous Land of Oz
Book #4: Dorothy and the Wizard in Oz
Book #12: The Tin Woodman of Oz
Book #13: The Magic of Oz
Book #1: The Lost Princess of Oz
Book #2: The Land of Oz
Book #3: Ozma of Oz
Book #5: The Road to Oz
Book #1: Wizard of Oz
Book #1: The Wonderful Wizard of Oz with Pictures by W. W. Denslow
Book #1: The Wizard of Oz, with eBook
Book #1: The Wonderful Wizard of Oz (Wicked Edition on Black Pages)
Book #1: The Complete Oz Collection