The Wonderful Wizard of Oz is a children's novel written by L. Frank Baum and illustrated by W. W. Denslow. It was originally published by the George M. Hill Company in Chicago in 1900, and has since been reprinted countless times, sometimes under the name The Wizard of Oz. The story chronicles the adventures of a girl named Dorothy in the Land of Oz. It is one of the best-known stories in American popular culture and has been widely translated. Its initial success led to Baum's writing and having published thirteen more Oz books.

The Marvelous Land of Oz, commonly shortened to The Land of Oz, published in 1904, is the second of L. Frank Baum's books set in Land of Oz, and the sequel to The Wonderful Wizard of Oz. It is the only book in the series in which Dorothy Gale does not appear. This and the next 34 Oz books of the famous forty were illustrated by John R. Neill. The book was made into a Canadian animated feature film of the same name in 1987.

Book 4 in the Oz series. Illustrated by John R. Neill. It was published on June 18, 1908 and reunites Dorothy with the humbug Wizard from The Wonderful Wizard of Oz (1900). This is one of only two of the original fourteen Oz books (the other being The Emerald City of Oz (1910), to be illustrated with watercolor paintings. Written shortly after the 1906 San Francisco earthquake, the book starts with an earthquake in California. Dorothy and others are swallowed up by cracks in the earth, and fall into an underground cavern, where they begin their adventures.

Book 6 of the Oz series. Illustrated by John. R. Neill. It was also adapted into a Canadian animated film in 1987. It is the story of Dorothy Gale and her Uncle Henry and Aunt Em coming to live in Oz permanently. But while they are toured through the Quadling Country, the Nome King is assembling allies for an invasion of Oz.

Book 7 of the Oz series. Illustrated by John. R. Neill. Adapted to film in 1914 through Baum's "Oz Film Manufacturing Company."

Book 8 of the Oz series. Illustrated by John. R. Neill. The book actually has little to do with Tik-Tok and is primarily the quest of the Shaggy Man (introduced in The Road to Oz) to rescue his brother, and his resulting conflict with the Nome King. The endpapers of the first edition held maps: the first maps printed of Oz (and the neighboring countries)

[Book 9 of the Oz series. Illustrated by John. R. Neill.] It was Baum's personal favorite of the Oz books and tells of Cap'n Bill and Trot journeying to Oz and, their fight, with the Scarecrow, against the cruel King Krewl of Jinxland. Cap'n Bill and Trot (Mayre Griffiths) had previously appeared in two other novels by Baum, The Sea Fairies and Sky Island.