When copying data from this family tree, please include a reference to the origin: Marieke Cooper, "Family tree Cooper, Kooper, Oostwal, Robert, Ooteman en Blokland", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-cooper/I1859.php : accessed February 21, 2026), "Pieternella Antonia van der Horst (± 1807-????)".
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