| Generation 1 - Aaltje Henderika Kool: Born - Wednesday 08 April 1903 - Noordhorn, Zuidhorn, Groningen, Nederland |
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| Generation 1 - Aaltje Henderika Kool & Barteld Lammert Hopma: Married - Wednesday 20 July 1927 - Haren, Groningen, Nederland |
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| Generation 2 - Tonnis Kool: Born - Thursday 12 May 1870 - Delfzijl, Groningen, Nederland |
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| Generation 2 - Tonnis Kool: Died - Monday 09 February 1942 - Haren, Groningen, Nederland |
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| Generation 2 - Tonnis Kool & Zwaantje Goldhoorn: Married - Thursday 23 July 1896 - Ten Boer, Groningen, Nederland |
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| Generation 2 - Zwaantje Goldhoorn: Born - Wednesday 08 July 1868 - Sint Annen, Ten Boer, Groningen, Nederland |
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| Generation 2 - Zwaantje Goldhoorn: Died - Monday 05 February 1951 - Stadskanaal, Groningen, Nederland |
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| Generation 3 - Cornelis Kool: Born - Saturday 19 July 1828 - Oosterwijtwerd, 't Zandt, Groningen, Nederland |
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| Generation 3 - Cornelis Kool: Died - Wednesday 20 July 1887 - Holwierde, Bierum, Groningen, Nederland |
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| Generation 3 - Cornelis Kool & Aaltje Wigbolts Bakker: Married - Saturday 26 April 1856 - Loppersum, Groningen, Nederland |
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| Generation 3 - Aaltje Wigbolts Bakker: Born - Saturday 14 July 1832 - Wirdum, Loppersum, Groningen, Nederland |
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| Generation 3 - Aaltje Wigbolts Bakker: Died - Sunday 05 September 1909 - Holwierde, Bierum, Groningen, Nederland |
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| Generation 4 - Harm Walles Kool: Born - 1799 - Groningen, Groningen, Nederland |
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| Generation 4 - Harm Walles Kool: Baptised - Sunday 13 January 1799 - Groningen, Groningen, Nederland |
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| Generation 4 - Harm Walles Kool: Died - Sunday 17 August 1873 - Oosterwijtwerd, 't Zandt, Groningen, Nederland |
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| Generation 4 - Harm Walles Kool & Cornelia Kornelis Star: Married - Saturday 05 October 1822 - Groningen, Groningen, Nederland |
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| Generation 4 - Cornelia Kornelis Star: Born - 1797 - Oosterwijtwerd, 't Zandt, Groningen, Nederland |
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| Generation 4 - Cornelia Kornelis Star: Baptised - Sunday 03 September 1797 - Oosterwijtwerd, 't Zandt, Groningen, Nederland |
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| Generation 4 - Wigbolt Roelfs Bakker: Born - 1800 - Godlinze, Bierum, Groningen, Nederland |
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| Generation 4 - Wigbolt Roelfs Bakker: Died - Saturday 20 February 1836 - Wirdum, Loppersum, Groningen, Nederland |
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| Generation 4 - Hindrikje Tonnis Braam: Born - 1806 - Godlinze, Bierum, Groningen, Nederland |
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