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Etidorhpa; or, The End of Earth. : The Strange History of a Mysterious Being and the Account of a Remarkable Journey

By Lloyd, John Uri,.
Salt Lake City, UT : Project Gutenberg, 2011 .
1 online resource : , Wikipedia page about this book: https://en.wikipedia.org/wiki/Etidorhpa | Release date is 2011-10-16

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The Hollow Earth

By Ives, F. T..
Salt Lake City, UT : Project Gutenberg, 2022 .
1 online resource : , Release date is 2022-05-19

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In Caverns Below

By Coblentz, Stanton A..
Salt Lake City, UT : Project Gutenberg, 2021 .
1 online resource : , Wikipedia page about this book: https://en.wikipedia.org/wiki/Hidden_World_(novel) | Later edition published with title: Hidden World. | Release date is 2021-11-24

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