Proceedings of the fourth international soil classification workshop[held in]Rwanda on 2-12 June, 1981  : part 1: papres 
/ ed. F.H;beinroth, H.Neel, H.Eswaran 
. - Brussels  : ABOS-AGCD, 1983
. - VII-518 p.  : ill.,couv.ill.  ; 29 cm. 
 - Agricultural editions  4 .
<br/><br/><label>Source: </label> don 
<br/><br/><label>Universal Decimal Class. No.: </label>631.44