Duckham, A. N. <br/><br/>
Farming systems of the world 

 - London :  Chatto & Windus,  1970 
 - 542 p.  : ilus. ; mapas 
<br/><br/><label>LCCN: </label>22516 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Sistemas de cultivo.
<br/><br/><label>Dewey Class. No.: </label>631.5  / D82