Horan, N. J. <br/><br/>
Biological wastewater treatment systems  theory and operation 
N. J. Horan 
 - Chichester  John Wiley & Sons  1990 
 - 310 p. : ill. ; 25 cm. 
<br/><br/><label>ISBN: </label>0471924253 
<br/><br/><label>LCCN: </label>89-16629 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Sewage--Purification--Biological treatment