Norstog, Knut,  1921- <br/><br/>
Plant biology / 
Knut Norstog, Robert W. Long. 
 - Philadelphia :  W. B. Saunders,  1976. 
 - vi, 585 p . :  ill. ;  27 cm. 
<br/><br/>Includes indexes. 
<br/><br/><label>ISBN: </label>072166864X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Botany.