Introduction to Environment  Textual Documents 
M.N.Sastri 
 - 2nd ed. 
 - Maharashtra  Himalaya Publishing  2005 
 - 351pg:  23cm. 
<br/><br/><label>ISBN: </label>81-8318-177-5 
<br/><br/><label>Subjects--Index Terms: </label>Ecology G- Ecology 
<br/><br/><label>Dewey Class. No.: </label>577