Geni World Family Tree
People: Francois Willem Daniel Prins, Gesina Maria Christiaansdr Vaillant, Willem Arij Prins and 22 others.
FamilySearch Stamboom
People: Johannes Petrus Godefriedus Kok, Susanna Francisca Maria Haije, Rudi Kok and 68 others.
Kok Web Site
People: Anna Elisabeth Kok, Johannes Kok, Antje Hoogenbos and 179 others.
Kok Web Site
People: Johannes Petrus Godefriedus Kok, Private, Johannes Kok and 117 others.
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People: Jan Kok, Marijke Prins, Johannes ( Joannes ) Kok and 37 others.