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Waterstand beneden volzee. Kop van de Buitenhaventong. accession number credit line Waterstand beneden volzee Kop van de Buitenhaventong havenwerken metselwerken waterbouw exhibition history object history PDold credit line Nationaal Archief Den Haag Fotocollectie Rijkswaterstaat archiefinventaris inventarisnummer Kolkow von