Small-scale mining in the developing countries.
Small-scale mining in the developing countries.
- 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.
Mineral industries--Developing countries.
338.64 UNI
"United Nations publication. Sales no.: E.72.II.A.4."
Bibliography: p. 158-166.
Mineral industries--Developing countries.
338.64 UNI
