Mineral resources development with particular reference to the developing countries : Department of Economic and Social Affairs
For the purpose of this report, the tern "mineral resources", meaning natural mineral concentrations capable of exploitation, will embrace both mineable products, notaby metallic minerals, minerals used in the chemical and quarried products such as cement and construction materials, clays,...
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New York
United Nations
1970
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| Thư viện lưu trữ: | Trung tâm Học liệu Trường Đại học Cần Thơ |
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