@book{27573,
	author = {Collier, Arthur J. and Knechtel, Maxwell M.},
	title = {The coal resources of McCone County, Montana,},
	publisher = {U.S. Govt. Print. Off.,},
	year = {1939.},
	address = {Washington,},
	note = {At head of title: United States Department of the Interior. Geological Survey.}
}