@book{329260,
	author = {Walton, William Clarence.},
	title = {Principles of groundwater engineering /},
	publisher = {Lewis Publishers,},
	year = {c1991.},
	address = {Chelsea, Mich. :},
	note = {H.B},
	url = {http://www.loc.gov/catdir/enhancements/fy0744/90090765-d.html}
}