37) Princess of Mars, by Edgar Rice Burroughs

The first of the famous series of books revolving around the adventures of Captain John Carter of Virginia on Mars, the first book written by Burroughs (who went on to create Tarzan), first published in 1912. Classic pulp stuff; our hero has to fight off the non-human brutes and deal with treachery from his own race, but has loyal companions and the love of the (mostly naked) princess. One thing that Burroughs does do well is the conscious archaism of the speaking style of the Martian characters, and the sense of a varied physical and human/non-human geography on the planet. He also manages to have a moderately cliff-hanger ending; the original readers would have been very eager to find out what came next. (Myself, I can wait.)