Small-scale mining in the developing countries /
United Nations.
- New York : United Nations, 1972.
- vi, 171 p. illus. 28 cm.
"United Nations publication. Sales no.: E.72.II.A.4."
Bibliography: p. 158-166.
73154202
Mineral industries--Developing countries.
JX1977 / .A2 ST/ECA/155
300/.8 s 338.2 / UNS
"United Nations publication. Sales no.: E.72.II.A.4."
Bibliography: p. 158-166.
73154202
Mineral industries--Developing countries.
JX1977 / .A2 ST/ECA/155
300/.8 s 338.2 / UNS