Quality status report of the North Sea: Contribution by the Netherlands Second International Conference on the protection of the North Sea, London, 1987
DGW (1987). Quality status report of the North Sea: Contribution by the Netherlands Second International Conference on the protection of the North Sea, London, 1987. DGW notitie, GWWS-87. Dienst Getijdewateren: Den Haag.
Deel van: DGW notitie. Dienst Getijdewateren: Middelburg, meer
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