Wilt Gerbens Koolstra - Pedigree | FamilyCentral
 11 Nov 1898 -
 3 Jul 1873 -
 24 Dec 1876 -
 1844 - 24 Sep 1903
  - 23 Sep 1910
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Family Group
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Family Group
 13 Apr 1800 - 15 May 1863
  - 31 Oct 1810
 1758 - 15 Feb 1831