Izaak de Vries was the son of Lazarus de Vries and Johanna Kamerling. He married Gonda Cats in 1896. She was the daughter of Heiman Cats and Rachel Bendien.
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In addition, a Jokos file (number 36334) on this person is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.
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