Roosje Wolf-Leezer was a Zionist. She followed Hebrew lessons. F.J. Hulst and H.M. Luning, De joodse gemeente Assen. Geschiedenis van een behoorlijke Kille, 1740-1976 (Assen 1993)
In addition, a Jokos file (number 13609) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.The Jokos file reveals that a claim was lodged for compensation for valuables surrendered to the Lippmann-Rosenthal looting bank (L-claim, number 13160/2139).