Land of Terror - Pellucidar #6 Author:Edgar Rice Burroughs Danger and Mystery at the Earth's Core — David Innes, discoverer of the Inner World of Pellucidar, had carved out his own empire among the cavemen there. He had set out on an exploration of new territories--and disappeared! — A rescue expedition under the leadership of his cave-woman queen, Dian the Beautiful, began a desperate search for him--onl... more »y to plunge them both into an ordeal of incredible danger.« less