Crites, Ronald W., <br/><br/>
Natural wastewater treatment systems / 
Ronald W. Crites, E. Joe Middlebrooks, Sherwood C. Reed. 
 - Second edition. 
 - 552 pages :  illustrations ;  24 cm. 
 - Civil and environmental engineering .
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>0849338042 (alk. paper)  RM649.90 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Sewage--Purification--Biological treatment.<br/>Sewage sludge--Management.