When copying data from this family tree, please include a reference to the origin: Tineke Fopma, "Family tree Fopma/Bouma", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-fopma-bouma/I113120.php : accessed June 24, 2024), "Johannes Jacobus Henricus Johanneszn. Koppelman (1896-????)".
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