@book{107637,
	author = {Coblentz, Stanton A. and Paul, Frank R.},
	title = {In Caverns Below},
	publisher = {Project Gutenberg,},
	year = {2021},
	series = {Produced from Wonder Stories March, April, May 1935},
	address = {Salt Lake City, UT :},
	note = {Wikipedia page about this book: https://en.wikipedia.org/wiki/Hidden_World_(novel)},
	url = {https://www.gutenberg.org/ebooks/66815}
}