Sharma, P. D. <br/><br/>
Elements of ecology / 
by P. D. Sharma, foreword by R. Misra 
 - 4th rev. ed. 
 - Meerut :  Rastogi Publications,  1981 
 - xi, 373 p. :  ill. ;  22 cm. 
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>ISBN: </label> Rs. 15.75 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ecology
<br/><br/><label>Dewey Class. No.: </label>574.5