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r b toombs
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Cilt sonuçları
A survey of the mineral industry of southern Africa
R. B. Toombs · Mineral Resources Division, Dept. of Mines and Technical Surveys
275 sayfa · 1962
Mineral industries
Canadian minerals in national and international perspective
R. B. Toombs, American Institute of Mining, Metallurgical, and Petroleum Engineers · Mineral Resources Division, Dept. of Mines and Technical Surveys
63 sayfa · 1964
Mineral industries