Research Report North Central Weed Control Conference  : [proceedings], vol. 38, 1981 
/ ed., G. Calvin 
 - Champaing (Illinois):  North Central Weed Control Conference  , 1981 
 - 347 p.:  28 cm. 
<br/><br/><label>Subjects--Index Terms: </label>Malezas Control de plagas 
<br/><br/><label>Index Terms--Genre/Form: </label><br/>Congreso