@book{81243,
	author = {Norton, William Harmon,},
	title = {The Elements of Geology},
	publisher = {Project Gutenberg,},
	year = {2012},
	address = {Salt Lake City, UT :},
	note = {Release date is 2012-08-04},
	url = {https://www.gutenberg.org/ebooks/40404}
}