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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 Pellucidar. It first appeared as a four-part serial in All-Story Weekly from April 4–25, 1914. It was first published in book form in hardcover by A. C. McClurg in July, 1922.

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Back to the Stone Age is a novel by American writer Edgar Rice Burroughs, the fifth in his series set in the lost world of Pellucidar. It first appeared as a six-part serial in Argosy Weekly from January 9 to February 13, 1937 under the title Seven Worlds to Conquer. It was first published in book form in hardcover by Edgar Rice Burroughs, Inc. in September, 1937 under the present title, and has been reissued a number of times since by various publishers.

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Land of Terror is a 1944 fantasy novel by American writer Edgar Rice Burroughs, the sixth in his series about the fictional "hollow earth" land of Pellucidar. It is the penultimate novel in the series and the last to be published during Burrough's lifetime. Unlike most of the other books in the Pellucidar series, this novel was never serially published in any magazine because it was rejected by all of Burroughs's usual publishers.

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Pellucidar is a 1915 fantasy novel by American writer Edgar Rice Burroughs, the second in his series about the fictional "Hollow Earth" land of Pellucidar. It first appeared as a five-part serial in All-Story Weekly from May 1 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.

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Savage Pellucidar is a 1963 fantasy story collection by American writer Edgar Rice Burroughs, the seventh and final book in his series about the fictional "hollow earth" land of Pellucidar. It was published twelve years after Burroughs's death.

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Tanar of Pellucidar is a novel by American writer Edgar Rice Burroughs, the third in his series set in the interior world of Pellucidar. It first appeared as a six-part serial in The Blue Book Magazine from March–August 1929. It was first published in book form in hardcover by Metropolitan Books in May 1930.

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Tarzan at the Earth's Core is a novel by American writer Edgar Rice Burroughs, serialized in September 1929 to March 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.