Agriculture and water quality. 

 - London  HMSO UK           1976 
 - 469p.  cm. 
 - Its, technical bulletin. 32. .
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agricultural Industry
<br/><br/><label>Dewey Class. No.: </label>X9(J)Og(D24).3.N7, L6/GD