Tjeerd. Dorus Rijkers; De Heldersche Menschenredder. Published by Egner in Helder (not: Den Helder) in 1928. "Nationaal Reddingmuseum Dorus Rijkers". Archived...
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Wikimedia Commons has media related to Willemsoord, Den Helder. Nationaal Reddingmuseum Dorus Rijkers (in Dutch) Marinemuseum (in Dutch) Stichting Museumhaven...
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