Wallis, J. A. N. <br/><br/>
Intensified systems of farming in the tropics and subtropics / 
J. A. Nicholas Wallis. 
 - Washington, D.C. :  World Bank,  1997. 
 - xii, 203 p. :  maps ;  28 cm. 
<br/><br/>Includes bibliographical references. 
<br/><br/> Open access. 
<br/><br/><label>ISBN: </label>0821339443 
<br/><br/><label>LCCN: </label>9716487  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agricultural systems--Tropics.<br/>Dry farming--Tropics.<br/>Agricultural systems--Dry farming.