 Tarzan at the Earth's Core

Tarzan at the Earth's Core is a novel by American writer Edgar Rice Burroughs, published in 1930, the thirteenth in his series of twenty-four books about the title character Tarzan and the fourth in his series set in the interior world of Pellucidar.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, Jason Gridley launches an expedition to rescue Innes from the Korsars (corsairs), the scourge of the internal seas.