Billings, W. D. <br/><br/>
Plants and the ecosystem :  W. D. Billings. 

 - 154 paginas :  ilustraciones. 
 - Fundamentals of botany series .
<br/><br/><label>Subjects--Topical Terms: </label><br/>BOTANICA<br/>ECOLOGIA
<br/><br/><label>Dewey Class. No.: </label>581