David van Praag worked as an office-clerk and assistent at the Pedagogium Achisomog of the Apeldoornse Bos, where he started working on 27 January 1939.
Municipal Archives Apeldoorn, list of employees of the Apeldoornsche Bosch
Former Lager Westerbork. Documents of planned marriages which were not celebrated; municipal archives Westerbork, incorporated in the municipal archives of Midden-Drenthe in Beilen
Biography