@book{22722,
	author = {National Clay Pipe Institute (U.S.)},
	title = {Clay pipe engineering manual.},
	publisher = {National Clay Pipe Institute,},
	year = {c1982.},
	address = {Washington, D.C. :},
	note = {Includes index.},
	url = {http://www.archive.org/details/claypipeengineer00nati}
}