Catharina Helmina Koperberg was assistant at the library of the KNMI from 1938. She was fired there by decree of the nazis on 21 November 1940.
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Catharina Helmina and Ella Julie Koperberg were daughters of Marcus Koperberg and Susanna Benedicta Estella Catz.
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In addition, a Jokos file (number 53605) on this household is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stich…