Clausen, Jens Christian <br/><br/>
Experimental studies on the nature of species 

 - Washington, D.C.  Carnegie Institution of Washington  1949 
 - 174p.  25cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Botany
<br/><br/><label>LC Class. No.: </label>QK901.C55