Following a tip, two members of the Kolonne Henneicke found eight Jews in hiding in the basement of the building at 61 Amstel in Amsterdam: Theresia Kroonenburg, Samson Koopman, his wife Alida Hijman and their son Emanuel, Abraham Rubens and his wife Elisabeth Aap, Gerrit Vandien and his wife Rachel…
In addition, Jokos files (numbers 55764, 40281) on this family or other family members are at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.