@book{81079,
	author = {Olmsted, Denison,},
	title = {Letters on Astronomy :},
	publisher = {Project Gutenberg,},
	year = {2012},
	address = {Salt Lake City, UT :},
	note = {Release date is 2012-07-15},
	url = {https://www.gutenberg.org/ebooks/40240}
}