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..
Tik-Tok of Oz
"Tik-Tok of Oz" was more modestly produced than earlier Oz books, with twelve color plates instead of sixteen. Its first edition sold a little over 14,000 copies — a respectable figure, but 3,000 fewer than "The Patchwork Girl of Oz" had done the year before. Baum's books were facing stiff new competition — from his own earlier books. The reprint house M. A. Donohue & Co. had purchased the rights to several early Baum works from Bobbs-Merrill, and was marketing cut-rate editions. People were less willing to pay the usual $1.25 for a new Oz book, when the original "Wizard of Oz" was selling for $0.35.