@book{50725,
	author = {Gray, N. F.},
	title = {Drinking water quality /},
	publisher = {Cambridge University Press,},
	year = {c2008},
	address = {Cambridge ;},
	edition = {2nd ed.},
	note = {On cover: "Problems and solutions."},
	url = {http://www.loc.gov/catdir/enhancements/fy0838/2008276024-t.html}
}