Billings, W. D. <br/><br/>
Plants and the ecosystem / 
by W. D. Billings 
 - London :  Mac Millan,  1969. 
 - 154 p.  Paper Back 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Botany<br/>Ecology Of Plants
<br/><br/><label>Dewey Class. No.: </label>581.7    / BIL-P