Regional distribution of mining production and reserves of mineral commodities in the world
Schmidt
Regional distribution of mining production and reserves of mineral commodities in the world by Dr. Helmut Schmidt, Manfred Kruszona. - Hannover Federal Institute for Geosciences and Natural Resources 1982 - iv,125p. 30 cm
Regional distribution of mining production and reserves of mineral commodities in the world by Dr. Helmut Schmidt, Manfred Kruszona. - Hannover Federal Institute for Geosciences and Natural Resources 1982 - iv,125p. 30 cm