@book{192696,
	author = {Schweinfurth, Stanley P. and Finkelman, Robert B.},
	title = {Coal--a complex natural resource},
	publisher = {U.S. Dept. of the Interior, U.S. Geological Survey},
	year = {2003.},
	series = {U.S. Geological Survey circular},
	address = {Reston, Va.},
	note = {Shipping list no.: 2003-0281-P.}
}