Five Thousand Miles Underground by Roy Rockwood
Publisher: ManyBooks 1908
ISBN/ASIN: 1606648691
Number of pages: 146
What does an enterprising inventor do to follow up the marvelous dirigible-ship Monarch and an amazing submarine called Porpoise? Why, cobble them together into an astounding vessel that travels on both air and sea, and then head straight into his wildest adventure yet -- more than twenty thousand leagues under the Earth!
Science Fiction & Fantasy Science Fiction Classics