Pellucidar - Softcover

Pellucidar is a 1915 fantasy novel by American Edgar Rice Burroughs, the second in his series about the fictional "hollow earth" land of Pellucidar. It first appeared as a four-part serial in All-Story Weekly from May 8 to 29, 1915. It was first published in book form in hardcover by A. C. McClurg in September, 1923. A map by Burroughs of the Empire of Pellucidar accompanied both the magazine and book versions.
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, Abner, Ghak, and Dian the Beautiful. He soon encounters and befriends a new ally, Ja the Mezop of the island country of Anoroc; later he finds Abner, from whom he learns that in his absence the human revolt against the Mahars has not been going well.