Gretel Katz was placed in Huize Ten Vijver in The Hague circa 1939 with her brother Hans Katz. Huize Ten Vijver was a reception centre for Jewish children from Germany. Circa 10 May 1940 Huize Ten Vijver was evacuated and Gretel Katz was placed elsewhere. At the The Hague municipal archive there is a small photo album of Huize Ten Vijver (fotoalbum klein 35), containing a picture of Gretel Katz.
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