Williams, Moyle Strayhorn,    1921- <br/><br/>
Crop production levels and fertilizer use /    
by Moyle S. Williams and John W. Couston. 
 - Rome :   Food and Agriculture Organization of the United Nations,   1962. 
 - 48 p. :    ill. ;    23 cm. 
<br/><br/>Includes bibliography. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Fertilizers.--------<br/>Crop yields.--------