Billings, W. D. (William Dwight), 1910-, <br/><br/>
Plants, man, and the ecosystem / 
W. D. Billings. 
 - 2nd ed. 
 - Belmont, Ca. :  Wadsworth Publishing Co.,  1970. 
 - x, 160 paages :  illustrations ;  24 cm. 
<br/><br/> First and 3rd ed. pub. under title: Plants and the ecosystem 
<br/><br/>p. 149-151 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Botany--Ecology.