Clements, John Burton. <br/><br/>
Water and the land / 
by J.B. Clements and P. Topham. 
 - Oxford :  University Press,  1940. 
 - African welfare .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Erosion.<br/>Soil fertility.<br/>Water.<br/>Water-supply.