@book{50067,
	author = {Powell, John Wesley,},
	title = {Canyons of the Colorado},
	publisher = {Project Gutenberg,},
	year = {2005},
	address = {Salt Lake City, UT :},
	note = {Wikipedia page about this book: https://en.wikipedia.org/wiki/Powell_Geographic_Expedition_of_1869},
	url = {https://www.gutenberg.org/ebooks/8082}
}