use and disposal of wastes from phosphoric aid and 

 - New York  United Nations USA         1988 
 - 141p.  cm. 
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electrical
<br/><br/><label>Dewey Class. No.: </label>X 9 (E:898), M8