@book{26792,
	author = {Knowlton, Frank Hall, and Berry, Edward Wilber,},
	title = {The flora of the Denver and associated formations of Colorado /},
	publisher = {U.S. Gov't. Print. Off.,},
	year = {1930.},
	address = {Washington :},
	note = {At head of title: United States Department of the Interior.}
}