@book{93300,
	author = {Hartwig, G.},
	title = {The Subterranean World},
	publisher = {Project Gutenberg,},
	year = {2016},
	address = {Salt Lake City, UT :},
	note = {Release date is 2016-07-01},
	url = {https://www.gutenberg.org/ebooks/52466}
}