May Books 16) Carson of Venus, by Edgar Rice Burroughs
Another of the 1939 Retro-Hugo nominees, and the only one of which I had not heard before the nominations came through. It's pretty rubbish, really. There is an interesting evil Venusian city whose ideology is clearly modelled on the Nazis, but essentially this is a tale of Ruritanian conflicts which happen to be on Venus, involving our hero as the intended husband of a beautiful political heiress. There's also a desperate attempt to do a gynocracy which is very nearly as appalling as The Worm That Turned, but is fortunately abandoned after a chapter or two.