Environmental standards   A descri ption of United    

 - London  H M SO UK         1977 
 - 30p.  cm. 
 - Pollution paper,11 .
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geography- Environment
<br/><br/><label>Dewey Class. No.: </label>U:(G:55).3.N7, L7/GD