Klara van Aals worked as a student nurse in the Apeldoornse Bos, where she started working on 23 December 1940.
Municipal Archiv (Gemeentearchief) Apeldoorn; List of employees of the Apeldoornsche Bosch
Claartje van Aals was a nurse at the Apeldoornse Bos.
Her letters are published in: Als ik wil kan ik duiken... : brieven van Claartje van Aals, verpleegster in de joods psychiatrische inrichting …