@book{3518,
	author = {Clay, Henry Hurrell, and Bassett, W. H.},
	title = {Clay's handbook of environmental health.},
	publisher = {E & FN Spon,},
	year = {1999.},
	address = {London ;},
	edition = {18th ed. /},
	url = {http://www.loc.gov/catdir/enhancements/fy0651/98028781-d.html}
}