In addition, a Jokos file (number 35653) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.
Nathan Koster and Jeannette Oesterman married in 1917 in Zaandam. They had three children, of whom one did not live at home anymore when the war broke out. Stadsarchief Amsterdam, archiefkaart Nathan Koster