Welsh Soils Discussion Group, Soil fertility 

 - Welsh Soils Discussion Group  1965 
 - 95p.  fig., table 
<br/><br/><label>Nat. Bib. No.: </label>4618 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agriculture
<br/><br/><label>Universal Decimal Class. No.: </label>631.4  / WEL