Copyright status of The Wizard of Oz and related works in the United States
"The Wonderful Wizard of Oz" was published in 1900, and was the first to enter the public domain in "1956". This allowed Reilly & Lee, the publisher of all the other Oz books (as well as Baum's other books) to issue their own edition of "The Wizard of Oz", which had previously been published by George M. Hill Company and later by the Bobbs Merill Company after Hill went bankrupt..
The Wizard of Oz (1925 film)
The Wizard of Oz is a 1925 American silent fantasy-adventure comedy film directed by Larry Semon, who also performs in the lead role as a Kansas farmhand and later in the story disguised as the Scarecrow. This production, which is the only completed 1920s adaptation of L. Frank Baum's novel "The Wonderful Wizard of Oz", costars Dorothy Dwan as Dorothy, Oliver Hardy as the Tin Woodman in a portion of the film, and Spencer Bell briefly disguised as a less "cowardly" Lion than in the 1939 Metro-Goldwyn-Mayer version of Baum's work.