@book{218390,
	author = {United States},
	title = {Manual of Classification.},
	publisher = {U.S. Dept. of Commerce, Patent and Trademark Office, Search znd Information Resources},
	address = {Washington, D.C.},
	note = {Description based on: Dec.1992, basic manual.},
	url = {http://purl.access.gpo.gov/GPO/LPS47620}
}