Lal, J. B.  <br/><br/>
Environmental conservation / 
J. B. Lal. 
 - Dehradun :   International Book,  1987. 
 - 111 p. :  ill. ;  22 cm. 
<br/><br/>341  341 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Natural resources and energy.
<br/><br/><label>Dewey Class. No.: </label>333.7 / J1e