When copying data from this family tree, please include a reference to the origin: Ulrich Haasdijk, "Haasdijk family from Oldeboorn", database, Genealogy Online (https://www.genealogieonline.nl/haasdijk-family-from-oldeboorn/I120149.php : accessed June 17, 2024), "Derk Roelfs Roelfsema (± 1760-????)".
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