Abiva, Mhelwin M.  <br/><br/>
Socio-economic impacts of quarrying at the Padsan river along San Nicolas, Ilocos Norte  
Mhelwin M. Abiva 
 - [xii], 46 leaves   28 cm.  
<br/><br/> Thesis (BS Environmental Science) -- Mariano Marcos State University-College of Arts and Sciences, Batac City 
<br/><br/>Bibliography: leaf 33