In honour of the 70th birthday of Leentje Cohen-Smeer, her son I. Cohen ran a brief announcement in the Joodsche Weekblad on 20 June 1941. The address indicated is 82 Tilanusstraat, ground floor, in Amsterdam.
Het Joodsche Weekblad, 20 June 1941, 9
In addition, a Jokos file (number 7413) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.