The sunken world
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The Sunken World is a science fiction novel by American writer Stanton A. Coblentz. It was first published in book form in 1948 by Fantasy Publishing Company, Inc. in an edition of 1,000 copies. The novel originally appeared in the Summer 1928 issue of the magazine Amazing Stories Quarterly. It was Coblentz's first published science fiction novel. (This summary is from Wikipedia.)