@book{84802,
	author = {Marr, J. E.},
	title = {The Principles of Stratigraphical Geology},
	publisher = {Project Gutenberg,},
	year = {2013},
	address = {Salt Lake City, UT :},
	note = {Release date is 2013-10-16},
	url = {https://www.gutenberg.org/ebooks/43963}
}