Mineral processing in developing countries 

 - New York :  United Nations,  1980 
 - xii, 143 p. :  il. 
 - United Nations  ; ID/253 .
<br/><br/>Incluye bibliografía 
<br/><br/><label>Subjects--Topical Terms: </label><br/>INDUSTRIA MINERA--PAISES DESARROLLADOS
<br/><br/><label>Dewey Class. No.: </label>338.20917  / U58