@book{47185,
	author = {National Research Council (U.S.). and Longwell, John P. and ebrary, Inc.},
	title = {Coal},
	publisher = {National Academy Press,},
	year = {1995.},
	address = {Washington, D.C. :},
	note = {John P. Longwell, chair; Edward S. Rubin, vice-chair.},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10062824}
}