Gaņo, Leticia O. <br/><br/>
Environmental science/ 
Leticia O. Gaņo, Teresita R. Mariano, and Marilyn Rose M. Sacdalan 
 - Bulacan:  St. Andrew Publishing House,  c2008. 
 - vii, 202 pages :  illustrations ;  26 cm. 
<br/><br/>Includes bibliographical references and glossary. 
<br/><br/><label>ISBN: </label>978-9-71047268-0