Hudson, Norman W. <br/><br/>
Soil and water conservation in semi-arid areas / 
by Norman W. Hudson. 
 - Rome :  Food and Agriculture Organisation of the United Nations,  1987. 
 - xii, 172 p. :  ill. (some col.) 
 - FAO soils bulletin ;  no. 57 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Soil conservation<br/>Water conservation