TARZAN at THE EARTH'S CORE by Edgar Rice Burroughs 1930
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Literature Help: Novels: Plot Overview 192: Pellucidar
Tarzan at the Earth's Core is a novel by American writer Edgar Rice Burroughs, published in 1930, the thirteenth in his series of books about the title character Tarzan and the fourth in his series set in the interior world of Pellucidar.