@book{26415,
	author = {Hunter, John Frederick,},
	title = {Pre-Cambrian rocks of Gunnison river, Colorado,},
	publisher = {Govt. print. off.,},
	year = {1925.},
	series = {U.S. Geological survey.  Bulletin 777},
	address = {Washington,},
	note = {At head of title: Department of the interior.}
}