Helmer, Richard <br/><br/>
Water Pollution Control : A Guide to the Use of Water Quality Management Principles 
Helmer, Richard 
 -  CRC Press  1997 
 - On-campus e-Book by ebrary under Digital Library Program of Higher Education Commission (HEC) of Pakistan 
<br/><br/><label>ISBN: </label>9780203477540     
<br/><br/><label>Subjects--Topical Terms: </label><br/>Engineering & Technology