@book{165879,
	author = {National Research Council (U.S.). and Raven, Peter H. and ebrary, Inc.},
	title = {A biological survey for the nation},
	publisher = {National Academy Press,},
	year = {1993.},
	address = {Washington, D.C. :},
	note = {Committee chairman: Peter H. Raven.},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10055113}
}