Automation of wastewater treatment facilities :  WEF manual of practice no. 21 / 
Water Environment Federation 
 - 3rd ed. 
 - Alexandria, Virginia :  Water Environment Federation,  2007 
 - xxviii, 546 p. :  ill. ;  24 cm. 
<br/><br/> Includes index  'Prepared by Automation of Wastewater Treatment Facilities Task Force of Water Environment Federation' - verso 
<br/><br/><label>ISBN: </label>0071479376  RM427.50 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Sewage--Purification--Automation<br/>Sewage--Purification--Instruments