@book{26194,
	author = {Knowlton, Frank Hall,},
	title = {The Laramie flora of the Denver basin,},
	publisher = {Govt. print. off.,},
	year = {1922.},
	series = {U.S. Geological survey. Professional paper l30},
	address = {Washington,},
	note = {At head of title: Department of the interior.}
}