Back to the Stone Age Author:Edgar Rice Burroughs Its rescue operation successfully concluded, the great dirigible O-220 sailed away from Pellucidar, through the polar opening and back to the surface world. But they left behind one crew member, a brave man thought to be lost forever to the terrors of the primeval land inside the Earth. That man was Lieutenant von Horst, and these are his advent... more »ures. He wanders, friendless and alone, with danger behind every tree and bush. Witness also the growing love of this cultured refugee from civilization for a barbarian slave girl who first discourages him, then runs away, with a strange purpose which the reader must attempt to deduce.« less