Carr S J <br/><br/>
Technology For Small Scale Farmers In Sub Saharan Africa Experience With Food Crop Production In Five Major Ecological Zones 

 -  Washington : The World Bank 1990. 
 - 106 
<br/><br/><br/>Eng 
<br/><br/><label>ISBN: </label>0 8213 1355 X (Pbk)