Has anybody read these books? I find it interesting that anybody I tell about them, they all say the same thing, they didn't know there was a series of books, they thought there was just the one story they made the movie from. Well, it's not particularly easy to find all 15 stories, especially if you want the ones with the original illustrations in them...but if you can find them, I say it's well worth it, they're very good stories.
I've read The Wonderful Wizard of Oz, The Marvelous Land of Oz, Ozma of Oz, Dorothy and the Wizard in Oz, The Road to Oz, and am now reading through The Emerald City of Oz, which interestingly enough L. Frank Baum intended to be the last Oz book he wrote but is only halfway through the series. Why nobody ever bothered making a movie out of these, I'll never know.