@book{26268,
	author = {Campbell, Marius R.},
	title = {... The twentymile park district of the Yamps coal field, Routt county, Colorado,},
	publisher = {Govt. Print. Off.,},
	year = {1923.},
	series = {U.S.  Geological survey.  Bulletin 748},
	address = {Washington,},
	note = {At head of title: Department of the Interior.}
}