Purimfestivies at the kindergarten K&G at Nieuwe Keizersgracht in Amsterdam on March 12, 1939. From left to right Jaap Marcus, Marcel Stuiver, Rudie Kattenburg, Jopie (surname unknown), Sieg van Tijn, David Waterman en Leo Kattenburg N.I.W (New Israelitic Weekly)
In addition, a Jokos file (number 15170) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.