Trace elements in soils and crops/ 
Ministry of Agriculture. 
 - London :  H.M.S.O.,  1971. 
 - 217 p. ;  24 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Soils.
<br/><br/><label>LC Class. No.: </label>S591  / M55 1971