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United Nations Environment Programme ,  [Desertification Control Bulletin Number 22, 1993: A Bulletin of World Events in the Control of Desertification Restoration of Degraded Lands and Reforestation] ,  Desertification Control Bulletin Number 22, 1993: A Bulletin of World Events in the Control of Desertification Restoration of Degraded Lands and Reforestation

United Nations Environment Programme ,  [Recommendations for Utilization of Microbiological Process for Controlling Desertification and Improving the Productivity of Arid Lands] ,  Recommendations for Utilization of Microbiological Process for Controlling Desertification and Improving the Productivity of Arid Lands

United Nations Environment Programme ,  United Nations Environment Programme ,  [Large marine ecosystems: A global comparative assessment of baseline status and future trends. Volume 4] ,  Large marine ecosystems: A global comparative assessment of baseline status and future trends. Volume 4