Santos, Elma B.  <br/><br/>
Distribution patterns of gastropod population at the littoral zone of Paoay Lake, Ilocos Norte  
Elma B. Santos  
 -  1987 
 - xx, 142 leaves   28 cm. 
<br/><br/> Thesis (MS Biology) -- University of the Philippines, Diliman, Quezon City  
<br/><br/>Bibliography: leaves 76-80