At the Earth's Core (F-156)

Cover and title page art by Roy Krenkel, Jr. A noble-hearted young man participates in a daring experiment and then finds himself in a world inside the Earth, a world called "Pellucidar." Here, David Innes struggles to survive the many dangers of a primitive land, including fierce battles with prehistoric monsters, frightful creatures unknown to the surface world, and numerous other enemies such as evil men and the wicked Mahars.