Billings, W. D.  1910- <br/><br/>
Plants, man, and the ecosystem / 
W. D. Billings. 
 - 2d ed. 
 - California :  Wadsworth,  c1970. 
 - x, 160 p. :  ill., maps. 
 - Fundamentals of botany series .
<br/><br/> First ed. published under title: Plants and the ecosystem. 
<br/><br/><label>ISBN: </label>0333146336 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Plant ecology.<br/>Environmental sciences