Unday, Joel E.  <br/><br/>
Introduction to environmental science / 
Joel E. Unday, Shirtey O. Branzuela, Jill B. Dalisay, Mayette L. Aronin 
 - rev. ed.  
 - Quezon City:  MaxCor Publishing House,  c2012. 
 - 222p.;  ill. 
<br/><br/>Includes bibliographical reference 
<br/><br/><label>ISBN: </label>978-971-0167-06-7 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Environmental sciences <br/>Environmental protection 
<br/><br/><label>Dewey Class. No.: </label>Fil. 333.7 In61 2012