Swords of Mars, the eighth novel In Edgar Rice Burroughs' Barsoom series. Cover by Michael Whelan.
This is Whelan's least favorite of the covers he did for the Barsoom series, mainly for the predominance of the color yellow, which he doesn't like.
This novel is notable in the series for a couple of reasons:
First, John Carter returns as the story protagonist, something he hasn't been since the third book, The Warlord of Mars.
Second, the bulk of the story takes place not on Mars/Barsoom, but on its smaller, nearer moon Phobos/Thuria. There yet more strange races are encountered, and we learn that Thuria's natives call their world Ladan.














