Development of arid and semi-arid lands: Obstaclesand prospects
Development of arid and semi-arid lands: Obstaclesand prospects
- Paris : UNESCO, 1977.
- 42 p.
- (MAB Technical notes; 6) .
Incluye bibliografía
338 (252) =20 DEV No.6
Incluye bibliografía
338 (252) =20 DEV No.6