Billings, W.D. <br/><br/>
Plants,man and the ecosystems / 
by W.D Billings 
 - 2nd ed. 
 - New York :  McMillan Press Ltd ,  1964 . 
 - 160 p.  Paper Back 
<br/><br/><label>ISBN: </label>0333146336 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Botany<br/>Ecology<br/>Environment<br/>Geographic dstribution<br/>Plant communities
<br/><br/><label>Dewey Class. No.: </label>577  / BIL-P