Source of acquisition is the Archives of the Oeuvre de Secours aux Enfants (OSE), Paris, Tschlénoff fonds. The materials were found in the cellar of the Swiss Federation of Jewish Communities in Geneva after Tschlénoff's death in 1952, and were brought to Paris in 1988. The United States Holocaust Memorial Museum Archives received the collection via the United States Holocaust Memorial Museum’s International Archives Project in March, 2006.