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United Nations Environment Programme ,  USSR Commission for UNEP ,  Economic and Social Commission foe Asia and the Pacific ,  [Rangeland Improvement in Arid and Semi-Mud Zones and its Environmental and Socio-Economic Aspects: Proceedings of International Seminar] ,  Rangeland Improvement in Arid and Semi-Mud Zones and its Environmental and Socio-Economic Aspects: Proceedings of International Seminar