Penny , Malcolm  <br/><br/>
Pollution and conservation : 

 - Wayland :  London ;  1988. 
 - 48 p ; 24cm .  01 
 - 2024-08-15 
<br/><br/><label>ISBN: </label>1852103620 
<br/><br/><label>Nat. Bib. No.: </label>0010006 
<br/><br/><label>Nat. Bib. Agency Control No.: </label>PEN 
<br/><br/><label>Universal Decimal Class. No.: </label>333.7