Helgeson, Earl Adrian <br/><br/>
Methods of weed control /    
Earl Adrian Helgeson. 
 - Rome :   Food and Agriculture Organization of the United Nations,   1957. 
 - x, 189 p. :    ill. ;    23 cm. 
 - FAO agricultural studies ;   no. 36 .
<br/><br/>Includes bibliographical references (p.155 -158). 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Weeds --Control.------
<br/><br/><label>Dewey Class. No.: </label>632.58 HEL