@book{73937,
	author = {National Research Council (U.S.). and ebrary, Inc.},
	title = {Opportunities to improve the U.S. Geological Survey National Water Quality Assessment Program},
	publisher = {National Academy Press,},
	year = {c2002.},
	address = {Washington, D.C. ;},
	url = {http://site.ebrary.com/lib/strathmore/Doc?id=10032378}
}