Pellucidar
Author: Edgar Rice Burroughs
Written: 1915
Published: 1923
Source: Project Gutenberg
Pellucidar is a 1915 science fiction novel by 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 8–29, 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.
(Wikipedia)