Hester Hamburger had a cousin of the same age, sharing the same names. This cousin was half-Jewish and she was therefore exempted from deportation. In an attempt to postpone deportation for Hester Hamburger, they exchanged passports.
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In addition, a Jokos file (number 867) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.