veld 4: in kartonnen dossiermap G11 veld 2: Geb. 27 mei 1929 te Zeilberg [[Er ontbreken bladzijden met gegevens, die wel in GensData Pro staan. Het kan zijn dat die teruggegeven zijn aan Maria v. Kempen-Derks zonder er een kopie van te maken]] veld 5: Archief v. Aad Edelbroek veld 1: Gegevens van Maria Derks te Sambeek veld 3: Geh. met Sjef van Kempen April 1993
When copying data from this family tree, please include a reference to the origin: Aad Edelbroek, "Genealogy Van Ke(ij)steren", database, Genealogy Online (https://www.genealogieonline.nl/genealogie-van-kesteren/I529.php : accessed June 23, 2024), "Johannes "Jan" Derks (1935-1947)".
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