Sethi, Manmohan Singh. <br/><br/>
Understanding our environment /  
Manmohan Singh Sethi and Inderjeet Kaur Sethi. 
 - New Delhi :   Commonwealth Publishers ,   1991. 
 - xv,440p. :   ill.,figs. ;   23cm .  
<br/><br/>Includes references and index 
<br/><br/><label>ISBN: </label>8171691129  NULL 
<br/><br/><label>Subjects--Index Terms: </label>ENVIRONMENT 
<br/><br/><label>Dewey Class. No.: </label>333.7  / SET/U