Advances in agronomy. 
edited by A. G. Norman. 
 - New York :  Academic press,  c 1955. 
 - Vols. :  ill. ;  23 cm. 
<br/><br/> Includes Index. 
<br/><br/>V. 7-- ; 
<br/><br/>338  338 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agronomy.
<br/><br/><label>Dewey Class. No.: </label>630 / N781a