@book{72017,
	author = {Hartshorne, Henry,},
	title = {1931: A Glance at the Twentieth Century},
	publisher = {Project Gutenberg,},
	year = {2010},
	address = {Salt Lake City, UT :},
	note = {Release date is 2010-02-03},
	url = {https://www.gutenberg.org/ebooks/31171}
}