Water pollution control :  a guide to the use of water quality man agement principles / 
edited by Richard Helmer and Ivanildo Hespanhol . 
 - 5th. ed. 
 - London ;   New York :  E & FN Spon,   1997. 
 - xvi, 510 p. :  ill., maps ;   24 cm. 
<br/><br/> "Published on behalf of UNEP, United Nations Environment Program, Wa ter Supply & Sanitation Collaborative Council, World Health Organizatio n." 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>0419229108 
<br/><br/><label>LCCN: </label>98-123030 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Water quality management.<br/>Water-- Purification.
<br/><br/><label>Dewey Class. No.: </label>363.739/4