File:Mattenrol.jpg

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https://beeldbank.rws.nl archive copy at the Wayback Machine, Rijkswaterstaat must be mentioned as the source. Original text: Nederlands: "De (intellectuele) eigendomsrechten van het beeldmateriaal liggen bij de Rijkswaterstaat, Data-ICT-Dienst, Beeldarchief Rijkswaterstaat. Er gelden geen extra kosten voor auteursrechten maar wel is bij iedere publicatie bronvermelding verplicht: https://beeldbank.rws.nl archive copy at the Wayback Machine, Rijkswaterstaat". English: "The (intellectual) ownership of the image material lies with the Rijkswaterstaat, Data-ICT-Dienst, Beeldarchief Rijkswaterstaat. No extra costs are associated with copyright, although it is mandatory to acknowledge the source with each publication: https://beeldbank.rws.nl archive copy at the Wayback Machine, Rijkswaterstaat".