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Schutsluis te Sas van Gent bestek No . Houten vloer en aanleg metselwerk. accession number credit line Schutsluis te Sas van Gent bestek No Houten vloer en aanleg metselwerk metselwerken schutsluizen vloeren waterbouw exhibition history object history PDold credit line Nationaal Archief Den Haag Fotocollectie Rijkswaterstaat archiefinventaris