@book{104220,
	author = {Trimble, Donald E.,},
	title = {The Geologic Story of the Great Plains :},
	publisher = {Project Gutenberg,},
	year = {2020},
	series = {Geological Survey bulletin, 1493.},
	address = {Salt Lake City, UT :},
	note = {Release date is 2020-10-06},
	url = {https://www.gutenberg.org/ebooks/63396}
}