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The processing and marketing of manganese : areas for international co-operation : report / by the UNCTAD secretariat.
- United Nations,
- 1981.
- [Geneva] :
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Study on the relationship between disarmament and development : report / by the secretary-general [Kurt Waldheim ; prep. by the Group of governmental experts on the relationship between disarmament and development, Ljubivoje AcÃmovic...et al.].
- United Nations,
- 1981.
- [Geneva] :