Gray N. F. <br/><br/>
Biology of wastewater treatment / 
N. F. Gray, University of Dublin, Ireland. 
 - Second edition. 
 - London :  Imperial College Press,  2004. 
 - xviii, 1421 pages :  illustrations. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>9781860943324 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Sewage--Purification--Biological treatment.<br/>Sewage disposal.<br/>Biotechnology.
<br/><br/><label>LC Class. No.: </label>TD 755  / GRA 2004.