In addition, a Jokos file (number 32364) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.
Hijman van Beem was a diamond worker prior to the German Occupation; he is registered with ANDB's as a Diamond Worker's Union member. Hijman was certified as a Brillantslijpen in 1909 and frequently moved between Antwerp and Amsterdam for work.