Small-scale mining in the developing countries. 

 - New York:  United Nations,  1972. 
 - vi, 171 p.  illus.  28 cm. 
<br/><br/> "United Nations publication. Sales no.: E.72.II.A.4." 
<br/><br/>Bibliography: p. 158-166. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mineral industries--Developing countries.
<br/><br/><label>Dewey Class. No.: </label>338.64 UNI