L. Frank Baum wrote 14 books set in Oz. Additional books have been written by other authors.
https://en.wikipedia.org/wiki/List_of_Oz_books
L. Frank Baum, the man who wrote The Wonderful Wizard of Oz, also wrote 13 sequels.
L Frank Baum wrote the original Oz books.
Lyman Frank Baum [May 15, 1856-May 6, 1919] wrote 'The Wizard of Oz'. The author published the book in 1900. It was the first of 14 books that the writer and Oz series originator was to write about the beautiful, enchanted, magical lands of Oz.
Lyman Frank Baum
Lyman Frank Baum, also known as L Frank Baum.
There is no book by that title. The movie was based upon two of L. Frank Baum's books Ozma of Oz and The Marvelous Land of Oz.
The 1985 film Return to Oz is based on the two books that author and Oz series originator Lyman Frank Baum [May 15, 1856-May 5, 1919] wrote as immediate sequels to The Wizard of Oz: The Marvelous Land of Oz [1904], and Ozma of Oz [1907].
L. Frank Baum wrote children's books, especially fantasy stories like the Oz books.
The Wizard of Oz. Based on L. Frank Baum's popular books set in the land of Oz. His stories have inspired other books set in the land of Oz (Gregory Maguire's Wicked and Son of a Witch), four Broadway shows (The Wizard of Oz, The Wiz, The Boy From Oz, And Wicked), and various other movies and tv shows.
Lyman Frank Baum [May 15, 1856-May 6, 1919] wrote the very first version of 'The Wizard of Oz'. The first edition was published in 1900. It was the first of 14 books that the author and Oz series originator was to write about the beautiful, enchanted, magical lands of Oz.
Son Hee-joon wrote Dorothy of Oz.
L. Frank Baum wrote many Oz books which did not feature Dorothy Gale. But most movies about Oz were based on the original Wizard of Oz like the classic MGM 1939 film starring Judy Garland.