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Izaak Bennedictus Kolthoff, birth 19 Jul 1871 Assen, Drenthe, Nederland, died 29 Oct 1942 Auschwitz, Katowice, Polen, son of Bennediktus Abraham Kolthoff and Martha Lezer to:
Martha Kolthoff, birth 8 Apr 1873 Hoogeveen, Drenthe, Nederland, died 29 Oct 1942 Auschwitz, Katowice, Polen, daughter of Samuel Abraham Kolthoff and Betje Lezer
1) Betje Martha Kolthoff, birth 15 Jan 1915 Hoogeveen, Drenthe, Nederland, died 2 Aug 1995 Bussum to:
Harry Karel de Vries, birth 22 Jul 1910 Amersfoort, Utrecht, Nederland, died 12 Jan 1967 Utrecht, son of David Hartog de Vries and Nanette van Baren
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