@book{25150,
	author = {Lee, Willis T.},
	title = {Coal fields of Grand Mesa and the West Elk Mountains, Colorado,},
	publisher = {Government print. off.,},
	year = {1912.},
	series = {U.S. Geological survey. Bulletin 510},
	address = {Washington,},
	note = {At head of title: Department of the Interior.}
}