Pagunsan, Pearle T. <br/><br/>
Caring for the Filters 

 -  Philippine Publishing House  2003 
<br/><br/> Includes bibliographical references. 
<br/><br/><label>ISBN: </label>9715811329 
<br/><br/><label>Dewey Class. No.: </label>616.61 P14 2003 c1