Castillo, Le Gilian G.  <br/><br/>
Biomonitoring of toxic elements pollution using roadside vegetation along the National highway of District I, Ilocos Norte / 
Le Gilian G. Castillo 
 -  2017  
 - xv, 87 leaves ;  28 cm.  
<br/><br/> Thesis (BS Biology) -- Mariano Marcos State University - College of Arts & Sciences, City of Batac, 2017.<br/> 
<br/><br/>Bibliography:  leaves 45-48