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United Nations Environment Programme ,  [Desertification Control Bulletin: A Bulletin of World Events in the Control of Desertification Restoration of Degraded Lands and Reforestation No. 19] ,  Desertification Control Bulletin: A Bulletin of World Events in the Control of Desertification Restoration of Degraded Lands and Reforestation No. 19

United Nations Environment Programme ,  [Desertification Control Bulletin Number 27, 1995: A Bulletin of World Events in the Control of Desertification Restoration of Degraded Lands and Reforestation] ,  Desertification Control Bulletin Number 27, 1995: A Bulletin of World Events in the Control of Desertification Restoration of Degraded Lands and Reforestation

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 ,  [Desertification Control Bulletin Number 23, 1993: A Bulletin of World Events in the Control of Desertification Restoration of Degraded Lands and Reforestation] ,  Desertification Control Bulletin Number 23, 1993: A Bulletin of World Events in the Control of Desertification Restoration of Degraded Lands and Reforestation

United Nations Environment Programme ,  [Desertification Control Bulletin Number 26, 1995: A Bulletin of World Events in the Control of Desertification Restoration of Degraded Lands and Reforestation] ,  Desertification Control Bulletin Number 26, 1995: A Bulletin of World Events in the Control of Desertification Restoration of Degraded Lands and Reforestation

United Nations Environment Programme ,  [Desertification Control Bulletin: A Bulletin of World Events in the Control of Deserts, Restoration of Degraded Lands and Reforestation Number 20, 1991] ,  Desertification Control Bulletin: A Bulletin of World Events in the Control of Deserts, Restoration of Degraded Lands and Reforestation Number 20, 1991

United Nations Environment Programme ,  [Desertification Control Bulletin Number 32, 1998: A Bulletin of World Events in the Control of Desertification Restoration of Degraded Lands and Reforestation] ,  Desertification Control Bulletin Number 32, 1998: A Bulletin of World Events in the Control of Desertification Restoration of Degraded Lands and Reforestation

United Nations Environment Programme ,  [Desertification Control Bulletin Number 24, 1994: A Bulletin of World Events in the Control of Desertification Restoration of Degraded Lands and Reforestation] ,  Desertification Control Bulletin Number 24, 1994: A Bulletin of World Events in the Control of Desertification Restoration of Degraded Lands and Reforestation

United Nations Environment Programme ,  [Desertification Control Bulletin Number 16, 1988: A Bulletin of World Events in the Control of Desertification Restoration of Degraded Lands and Reforestation] ,  Desertification Control Bulletin Number 16, 1988: A Bulletin of World Events in the Control of Desertification Restoration of Degraded Lands and Reforestation

United Nations Environment Programme ,  [Desertification Control Bulletin Number 21, 1992: A Bulletin of World Events in the Control of Desertification Restoration of Degraded Lands and Reforestation] ,  Desertification Control Bulletin Number 21, 1992: A Bulletin of World Events in the Control of Desertification Restoration of Degraded Lands and Reforestation