Originally published in 1920
Originally published in 1920
This title, to the best of my knowledge, is in the public domain, as are most of Burroughs' books. The original text can be found here, which I modified slightly to create the ebook edition presented on this site.
According to Wikipedia: "Thuvia, Maid of Mars is a science fiction novel by Edgar Rice Burroughs, the fourth of the Barsoom series. The principal characters are the Son of John Carter of Mars, Carthoris, and Thuvia of Ptarth, each of whom appeared in the previous two novels. While typical in many ways of Burrough's Barsoom novels, it also includes some inventive elements.