Synthetic Men of Mars is an Edgar Rice Burroughs science fiction novel, the ninth of his famous Barsoom series. It was first published in the newspaper Argosy Weekly in six parts in early 1939. The first complete edition of the novel was published in 1940.
One notable aspect of the novel is that it explores potential dangers of cloning and genetic engineering years before these themes became commonplace in science fiction.
for this story has expired in Australia
, and thus now resides in the public domain
there. The text is available via Project Gutenberg Australia