Balicao, Narly D.  <br/><br/>
Nitrate level analysis of the groundwater in cropped lands in San Marcelino, Dingras, Ilocos Norte 
Narly D. Balicao  
 -  2008 
 - xiv, 37 leaves   28 cm. 
<br/><br/> Thesis (BS Environmental Science) -- Mariano Marcos State University-College of Agriculture, Food and Sustainable Development, Batac City   
<br/><br/>Bibliography: leaves 24-25