When copying data from this family tree, please include a reference to the origin: Elly Crone-Kraaijeveld, "Family tree Goedhart en Manni", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-goedhart-en-manni/I21759.php : accessed June 25, 2024), "Hendrikus Johannes de Graaf (1905-1978)".
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