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In page L. Frank Baum bibliography:

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Early film treatments of Baum's book included 1910 and 1925, as well as Baum's own venture The Oz Film Manufacturing Company. Metro Goldwyn Mayer made the story into the now-classic movie The Wizard of Oz (1939) starring Judy Garland as Dorothy Gale. It was only MGM's second feature-length film in three-strip Technicolor (the first being Sweethearts (1938), based on the Victor Herbert operetta). Among other changes, the film ended by treating the entire adventure as a dream. (Baum used this technique only in Mr. Woodchuck, and in that case the title character explicitly told the dreamer numerous times that she was dreaming.[citation needed])