The Biology of crop productivity / 

 - San Francisco :  Academic Press,  1980. 
 - xvii, 471 p. :  ill. ;  24 cm. 
<br/><br/><label>ISBN: </label>0121598500 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Crop yields.<br/>Crops
<br/><br/><label>Dewey Class. No.: </label>631 ACA 1980 A055 Or.