Helgeson Earl K. <br/><br/>
Methods of weed control 

 - Rome  Food and Agriculture Organization         1957 
 - x, 189p. Bibliography p.155-5  cm. 
 - Food and Agriculture Organization, Agricultural Studies. 36. .
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agriculture
<br/><br/><label>Dewey Class. No.: </label>J:4:2;I22, J7