Norstog, Knut. <br/><br/>
Plant biology / 
Knut Norstog, Robert W. Long. 
 - Philadelphia :  Saunders,  1976. 
 - vi, 585 p. :  ill. 
<br/><br/><label>ISBN: </label>072166864X 
<br/><br/><label>LCCN: </label>93044076     
<br/><br/><label>Subjects--Topical Terms: </label><br/>Botany.