English
Coblentz, Stanton A. (Stanton Arthur)
Wikipedia page about this book: https://en.wikipedia.org/wiki/Hidden_World_(novel) Later edition published with title: Hidden World.
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EPUB
Science fiction · Earthquakes -- Fiction · Nevada -- Fiction · Imaginary places -- Fiction · Earth (Planet) -- Internal structure -- Fiction · Imaginary societies -- Fiction · PS
Project Gutenberg #66815
Public domain in the USA.