Door Unknown photographer – GaHetNa (Nationaal Archief NL), CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=43776292
Door Unknown photographer – GaHetNa (Nationaal Archief NL), CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=43776292