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2
-
Rainwater harvesting in arid and semi-arid zones / Th.M. Boers.
- International institute for land reclamation and improvement,
- 1994.
- Wageningen :
-
Drainage principles and applications / ed.-in-chief H.P. Ritzema.
- International institute for land reclamation and improvement,
- 1994.
- Wageningen :