Sing, H.P  . <br/><br/>
Principles of environment conservation /  
H.S.Sing. 
 - 273p. :   chart ;   21cm .  
<br/><br/>NULL 
<br/><br/><label>ISBN: </label> NULL (Hb) 
<br/><br/><label>Subjects--Index Terms: </label>ENVIRONMENTAL CONSERVATION 
<br/><br/><label>Dewey Class. No.: </label>363.69  / SIN/P