“A Journey to the Centre of the Earth” by Jules Verne — a free Project Gutenberg ebook, available to read as an EPUB on BookMarket.
Subjects: Adventure stories; Earth (Planet) -- Core -- Fiction; Science fiction; Voyages, Imaginary -- Fiction. Original source: https://www.gutenberg.org/ebooks/18857.
This ebook is in the public domain in the United States; the Project Gutenberg eBook license applies to the original text.