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 Scarecrow of Oz
The Scarecrow of Oz is the ninth book set in the Land of Oz written by L. Frank Baum. Published on July 16, 1915, it was Baum's personal favorite of the Oz books and tells of Cap'n Bill and Trot journeying to Oz and, with the help of the Scarecrow, overthrowing the cruel King Krewl of Jinxland. Cap'n Bill and Trot (Mayre Griffiths) had previously appeared in two other novels by Baum, "The Sea Fairies" and "Sky Island".