Hudson n.w. <br/><br/>
Field  Engineering for Agricultural Development  

 - Oxford   Clarendon Press  1975 
<br/><br/><label>ISBN: </label>0 19 859456 9 
<br/><br/><label>LC Class. No.: </label>630/HUD 
<br/><br/><label>Dewey Class. No.: </label>630/HUD