Enlace original:
https://wedocs.unep.org//handle/20.500.11822/29122
United Nations Environment Programme
,
[Desertification Control Bulletin Number 13, 1986: A Bulletin of World Events in the Control of Desertification Restoration of Degraded Lands and Reforestation]
,
Desertification Control Bulletin Number 13, 1986: A Bulletin of World Events in the Control of Desertification Restoration of Degraded Lands and Reforestation