The Making of the Wizard of Oz: Movie Magic and Studio Power in the Prime of MGM;

We return to an era in which studio moguls were as eccentric and powerful as today's software barons, when studio hands were non-unionized yet intensely loyal to their studios, when no movie studio even thought about a future containing broadcast TV, when movie stars were better known than Presidents or Kings, and when Technicolor would give you any color except the one you wanted. Nonetheless, solving the creative problems inherent in bringing L. Frank Baum's novel "The Wizard of Oz" to the screen was seen as an invigorating set of challenges to be met and conquered.