Rosa Voorzanger-Sachs wrote a letter from Vught concentration camp to the family De Wit. This letter and a copy of the letter written by H.F. de Wit on 28 October 1943 to Rosa Voorzanger-Sachs in concentration camp Vught still remain.
Jewish Historical Museum, Documents collection, inv.nr 7319, 733…
In addition, Jokos files (numbers 32528, 32526) on this family or other family members are at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.