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 Linn
The Wizard of Linn is a science fiction novel by Canadian American writer A. E. van Vogt, a sequel to "Empire of the Atom". The novel was originally serialized in the science fiction magazine "Astounding Science Fiction" (April - June 1950). It was first published in book form in Germany in 1961 by Terra Sonderband, as "Der Zauberer von Linn".