Weaver, John E; Clements, Frederic E <br/><br/>
Plant ecology 

 - 2 
 -  McGraw-Hill Book Co., New York  1938 
 - 601 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Plant ecology; Botany
<br/><br/><label>Dewey Class. No.: </label>PG 581.5  WEA-P2