Hammer , Mark J. Water and wastewater technology. / Mark J. Hammer and Mark J. Hammer, Jr. - 7th ed. - Delhi : PHI Learning, c 2012. - xi, 460 p. : ill. ; 28 cm. Includes Index. 314 314 ISBN: 978-81-203-4601-7 Subjects--Topical Terms: Water technology. Dewey Class. No.: 628.72 / H183w