Answer
Baum authored 14 Oz books, a beloved series that captivated generations of readers. His first book, "The Wonderful Wizard of Oz," introduced the iconic characters of Dorothy, the Scarecrow, the Tin Man, and the Cowardly Lion. Subsequent books expanded the magical world of Oz, introducing new characters and adventures, and exploring themes of friendship, courage, and self-discovery. Baum's enchanting stories continue to inspire and entertain readers of all ages.