The Ets Haim Library has the marriage contract of Rachel Ossendrijver and Mozes van Jacob Cohen Treves, dated 10 sivan 5677 (31 May 1917).
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In addition, Jokos files (numbers 5720, 5719) on this family or other family members are at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.