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 Shaggy Man of Oz
The Shaggy Man of Oz (1949) is the thirty-eighth in the series of Oz books created by L. Frank Baum and his successors, and the second and last by Jack Snow. It was illustrated by Frank G. Kramer. The book entered the public domain in the United States when its copyright was not renewed as required.