Hammer,M.J. Water and wastewater technology / [by] Mark J.Hammer, Mark J.Hammer Jr. - 6th ed. - New Delhi PHI Learning 2011 - ix, 553 pages. Include index. ISBN: 9788120334991 Subjects--Topical Terms: Waste waterWaste technologyWaste treatment Dewey Class. No.: 628.43 / HAM