@book{29190,
	author = {Downing, Richard A.},
	title = {The Hydrogeology of the Chalk of North-West Europe /},
	publisher = {Clarendon Press,},
	year = {1993},
	address = {Oxford :},
	url = {http://www.loc.gov/catdir/enhancements/fy0637/92044648-t.html}
}