@book{90109,
	author = {Crosby, William O.},
	title = {Common Minerals and Rocks},
	publisher = {Project Gutenberg,},
	year = {2015},
	address = {Salt Lake City, UT :},
	note = {Release date is 2015-06-24},
	url = {https://www.gutenberg.org/ebooks/49271}
}