Billings, W. D. (William Dwight), 1910-, <br/><br/>
Plants and the ecosystem / 
by W. D. Billings. 
 - London :  MacMillan,  1964. 
 - iv, 154 pages:  illustrations ;  22 cm. 
<br/><br/>Bibliography: p. 147-148. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Botany--Ecology.