In response to a radio plea from Abner Perry, a scientist who with his friend David Innes has discovered the interior world of Pellucidar at the Earth's core, J

The author combines both his Tarzan and Pellucidar series by having the ape man visit the primitive land at the earth's core.

Tarzan finds an outpost of European knights and crusaders from a "forbidden valley" hidden in the mountains. His lion ally Jad-bal-ja puts in an appearance late

The further adventures of David Innes and Abner Perry at the Earth's core. We learn of new developments occuring in Pellucidar, including the capture of Tanar t

At the Earth's Core is a 1914 fantasy novel by American writer Edgar Rice Burroughs, the first in his series about the fictional "hollow earth" land of Pellucid