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| Utgitt
| London : Mining Journal Books , 1982
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| Omfang
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| Opplysninger
| "A study based on an International Workshop organized in Berlin (West) in August 1980 by the Department of Technical Co-operation for Development, United Nations, and the Development Policy Forum of the German Foundation for International Development.". - "DSE-DOK 1109 A/a IT 31-06-80.". - Har bibliografi.
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| Emner
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| ISBN
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