@book{30216,
	author = {Thornton Jeffrey A.},
	title = {Assessment and control of nonpoint source pollution of aquatic ecosystems :},
	publisher = {UNESCO ;},
	year = {c1999.},
	series = {Man and the biosphere series ;},
	address = {Paris :},
	url = {http://www.loc.gov/catdir/enhancements/fy0646/97009771-d.html}
}