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3
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Numerical modelling of groundwater basins : a user-oriented manual / J. Boonstra, N.A. de Ridder.
- International institute for land reclamation and improvement (ILRI),
- 1981.
- Wageningen :
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Training course for field assistants : Bura irrigation project (Kenya) / [S.A.M.T. Povel, B. Gietema, L.F. Kortenhorst].
- International institute for land reclamation and improvement (ILRI),
- 1981.
- Wageningen :
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Proceedings of the workshop on land evaluation for forestry : international workshop of the IUFRO/ISSS, Wageningen, The Netherlands, November 10-14, 1980 / ed. by P. Laban.
- International institute for land reclamation and improvement (ILRI),
- 1981.
- Wageningen :