This is aard 

 -    1978 
 - 32p., ill.,  26 cm 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agriculture <br/>Corn <br/>Grain <br/>Cultivation <br/>Vegetable <br/>Crops <br/>Root
<br/><br/><label>Universal Decimal Class. No.: </label>63(595)  / THI