Gray, N. F. <br/><br/>
Biology of wastewater treatment / 
N.F. Gray. 
 - Oxford [England] ;  New York :  Oxford University Press,  1989. 
 - xiv, 828 p. 
<br/><br/><label>ISBN: </label>0198590148  
<br/><br/><label>LCCN: </label>90011140     
<br/><br/><label>Subjects--Topical Terms: </label><br/>Sewage--Purification--Biological treatment.<br/>Sewage disposal.<br/>Biotechnology.