@book{27174,
	author = {Erdmann, C. E.},
	title = {... The Book Cliffs coal field in Garfield and Mesa counties, Colorado,},
	publisher = {U.S. Govt. print. off.,},
	year = {1934.},
	series = {U.S. Geological survey.  Bulletin 851},
	address = {Washington,},
	note = {At head of title: United States Department of the interior.}
}