Babcock, Ernest B. <br/><br/>
The Genus youngia 

 - Washington, D. C  Carnegie Institution of Washington  1937 
 - 2p.  26cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Youngia
<br/><br/><label>LC Class. No.: </label>QK495.Y8B3