@book{34566,
	author = {Trudgill, Stephen T.},
	title = {Soil and vegetation systems /},
	publisher = {Clarendon Press ;},
	year = {1988.},
	address = {Oxford :},
	edition = {2nd ed.},
	note = {Includes indexes.},
	url = {http://www.loc.gov/catdir/enhancements/fy0635/87024010-d.html}
}