Advances in agronomy / 
Edited by A.G. Norman. 
 - New York ;  London :  Academic Press. 
 - v. 
<br/><br/>Includes bibliogr. references 
<br/><br/>Vol. 12 (1960, xi,464 p. : ill.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agronomy--Research