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Pellucidar is a fantasy novel by Edgar Rice Burroughs, the second in his series about the fictional "hollow earth" land of Pellucidar.

David Innes and his captive, a member of the reptilian Mahar master race of the interior world of Pellucidar, return from the surface world in the Iron Mole invented by his friend and companion in adventure Abner Perry.

Emerging in Pellucidar at an unknown location, David frees his captive. He names the place Greenwich and uses the technology he has brought to begin the systematic exploration and mapping of the unknown land while searching for his lost companions…

Pellucidar first appeared as a four-part serial in All-Story Weekly from May 8–29, 1915. It was first published in book form in hardcover by A. C. McClurg in September, 1923. E-book: ePUB, 57 500 words, reading time approximately 4 hours, 45 min. AUDIO: Reading by Ralph Snelson, running time: 5 hours, 55 min. Unabridged full version. 

Edgar Rice Burroughs (1875-1950) was an American author, best known for his creation of the jungle hero Tarzan and the heroic Mars adventurer John Carter, although he produced works in many genres.