The Royal Book of Oz (1921) is the fifteenth in the series of Oz books, and the first, by Ruth Plumly Thompson, to be written after L. Frank Baum's death. Although Baum was credited as the author, it was written entirely by Thompson. Beginning in the 1980s, some editions have correctly credited Thompson,[1] although the cover of the 2001 edition by Dover Publications credits only Baum. The original introduction claimed that the book was based on notes by Baum, but this has been disproved. Baum's surviving notes, known as "An Oz Book" [2] are known from four typewritten pages found at his publisher's, but their authenticity as Baum's work has been disputed. Even if genuine, they bear no resemblance to Thompson's book.

Sky Island: Being the Further Adventures of Trot and Cap'n Bill after Their Visit to the Sea Fairies is a children's fantasy novel written by L. Frank Baum. A captivating tale by the master of make-believe recounts the further adventures of a little girl named Trot; Cap'n Bill; and their new friend, Button-Bright. Transported by a magic umbrella to an island in the sky, they meet six snub-nosed princesses, discover the King's treasure chamber, and meet Tourmaline the poverty Queen.

The Lost King of Oz, has been considered important throughout human history. In an effort to ensure that this work is never lost, we have taken steps to secure its preservation by republishing this book in a modern format for both current and future generations. This complete book has been retyped, redesigned, and reformatted. Since these books are not scans of the authors' original publications, the text is readable and clear.

A Philadelphia lad returns to Oz and joins forces with Jack Pumpkinhead to rescue Ozma and the Emerald City from conquest.

A continuation of the classic Oz series, this book is as fascinating and humorous as the the earlier series was. This story is about Kabumpo. Kabumpo is an Elegant Elephant. He is very old and wise, and has a kindly heart, as have all the Oz folks. In this book, you’ll meet Prince Pompa and Peg Amy, a charming Wooden Doll. There are new countries, strange adventures and the most surprising Box of Magic you have ever heard of. Ruggedo, the wicked old Gnome King, does a lot of mischief with this before Princess Ozma can stop him.