If you have ever wondered what a civilized man of the twentieth century would do if catapulted into an Old Stone Age where huge cave bears, saber-toothed tigers, monstrous carnivorous dinosaurs, mammoths, and mastodons roamed the savage terrain, you need look no further than Land of Terror, the sixth installment of Edgar Rice Burroughs's Pellucidar series. Years ago David Innes and Abner Perry bored straight down through five hundred miles...