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

 - London:  Heinemann Educational Books,  1972. 
 - 96p.;  col.ill.;  24 cm 
<br/><br/><label>ISBN: </label>0435573926 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Social Sciences
<br/><br/><label>Dewey Class. No.: </label>304.2  / HAR