Gertrude Josephine Koonen
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- 1 Gertrude Josephine Koonen [1]
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- 2 Pieter Hubertus Schengenga [1.1]
- 2 Karoline Elisabeth Schengenga [1.2]
- 2 Pieter Hubertus Schengenga [1.1]
- + Reinder Joseph Schengenga