@book{204996,
	author = {Thomas, Larry and ebrary, Inc.},
	title = {Coal geology},
	publisher = {John Wiley & Sons,},
	year = {2013.},
	address = {Chichester, West Sussex ;},
	edition = {2nd ed.},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10613137}
}