@book{4215,
	author = {Plummer, Charles C., and Carlson, Diane H.},
	title = {Physical geology /},
	publisher = {McGraw-Hill,},
	year = {c2008.},
	address = {Dubuque, IA :},
	edition = {12th ed. /},
	note = {Includes index.},
	url = {http://www.loc.gov/catdir/toc/ecip0721/2007026796.html}
}