Billings, W. D. <br/><br/>
Plants and the ecosystem / 
W. D. Billings. 
 - 3d ed. 
 - Belmont, Calif. :  Wadsworth Pub. Co.,  c1978. 
 - viii, 177 p. :  ill. ; 
<br/><br/> Second ed. published in 1970 under title: Plants, man, and the ecosystem.  Includes index. 
<br/><br/><label>ISBN: </label>0534005713 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Plant ecology.
<br/><br/><label>LC Class. No.: </label>QK901  / .B5 1978