@book{220740,
	author = {National Science Board U.S.},
	title = {Science & engineering indicators},
	publisher = {National Science Board},
	year = {1988-},
	address = {Arlington, Va.},
	note = {Description based on: 1993; title from v. contents page (viewed Nov. 22, 2000)},
	url = {http://purl.access.gpo.gov/GPO/LPS20723}
}