Cala, Paul Rafael C.  <br/><br/>
Design, fabrication and testing of a laboratory-scale trickling filter / 
Paul Rafael C. Cala  
 - City of Batac :  MMSU,  2015  
 - xii, 75 leaves ;  28 cm.  
<br/><br/> Thesis (Bs in Chemical Engineering) -- Mariano Marcos State University - College of Engineering, City of Batac, 2015 
<br/><br/>Bibliography:  leaves 55-56