Link
Yad Vashem - Shoah Victim Names
https://yvng.yadvashem.org/index.html?language=en&s_id=&s_lastName=zwick&s_firstName=ruth&s_place=rotterdam&s_dateOfBirth=&cluster=true
O.a. 2 pages of testimony over Rachel Ruth Zwick door Anna Loewenstein en Claire Irene Stern