When copying data from this family tree, please include a reference to the origin: J.H. Vroom, "Family tree Hams, Pisano uit Tubbergen en Neuenhaus Duitsland", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-hams-pisano/I136.php : accessed June 11, 2024), "Johannes Gerardus Koopman (1880-????)".
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