@book{91193,
	author = {Higgins, C. A. and Lummis, Charles Fletcher,},
	title = {Titan of Chasms: The Grand Canyon of Arizona},
	publisher = {Project Gutenberg,},
	year = {2015},
	address = {Salt Lake City, UT :},
	note = {Release date is 2015-10-31},
	url = {https://www.gutenberg.org/ebooks/50355}
}