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Models for the prediction of soil erosion and silt sedimentation in artificial lakes in Northern Ghana in order to determine life time / Alfred L. de Jager.
- SAWA consultancy group for water supply, sanitation and water management [etc.],
- 1989.
- Utrecht [etc.] :
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A note on Vetiver grass, identification and determination / Alfred L. de Jager.
- SAWA consultancy group for water supply, sanitation and water management [etc.],
- 1989.
- Utrecht [etc.] :