Hartmann, H. F. <br/><br/>
Nature in the balance 

 - South Yarra, Vic   : Heinemann Educational Australia,   1972 
 - 96p.   ; ill.   ; 25cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Pollution
<br/><br/><label>LC Class. No.: </label>PAM TD175.N37