@book{107130,
	author = {Illinois State Geological Survey},
	title = {Guide to Rocks and Minerals of Illinois},
	publisher = {Project Gutenberg,},
	year = {2021},
	series = {Illinois State Geological Survey. Educational series, 5.},
	address = {Salt Lake City, UT :},
	note = {Release date is 2021-09-15},
	url = {https://www.gutenberg.org/ebooks/66308}
}