Hudson, Norman W. <br/><br/>
Soil and water conservation in semi-arid areas 
/ by Norman W. Hudson, ... 
. - Rome  : FAO, 1987
. - 172 p.  : ill.  ; 30 cm. 
 - FAO soil bulletin   57 .
<br/><br/><label>ISBN: </label>9251026068 
<br/><br/><label>Source: </label> Fonds S.600 
<br/><br/><label>Universal Decimal Class. No.: </label>631.432.2