World Wide School
World Wide School: Etext of "At the Earth's Core"
This site provides the complete etext for Edgar Rice Burroughs's story, "At the Earth's Core."
Open Library of the Internet Archive
Open Library: At the Earth's Core
This ebook version of Edgar Rice Burroughs's At The Earth's Core has been made available in multiple formats by the Open Library. Editions of the full novel, organized by year of publication, may be accessed here.