Americal Public Health Association <br/><br/>
Standard methods for the examination of water & wastewater 

 - 21st ed 
 - Americal Public Health Association, Wahington  2005 
 - xxxvi, 
<br/><br/><label>ISBN: </label>0875530478 
<br/><br/><label>Dewey Class. No.: </label>628.16 APHA