@book{90506,
	author = {Squier, E. G. and Davis, E. H.},
	title = {Ancient Monuments of the Mississippi Valley :},
	publisher = {Project Gutenberg,},
	year = {2015},
	address = {Salt Lake City, UT :},
	note = {Wikipedia page about this book: https://en.wikipedia.org/wiki/Ancient_Monuments_of_the_Mississippi_Valley},
	url = {https://www.gutenberg.org/ebooks/49668}
}