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Excessive manuring and its effects on the nitrogen and phos-phorus concentrations in soil, ground-and susface water of -the north-west veluwe (the netherlands) / C.F. Hopstaken ..-. [et al.].
- Delft, [Holanda] : Delft Hydraulics Laboratory
- 25 p.
- Delft Hydraulics Communication no. 363 .