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 Making of The Wizard of Oz
The book was published in November 1977, after the film had been telecast a total of nineteen times. With 93 photos, the book tells readers how the film was made and describes the Golden Era of moviemaking in the 1930s and 1940s at Metro-Goldwyn-Mayer.