Hadassa van Cleef was deported to Westerbork in June 1943 from Vught on the so-called children's transport. She was seven months when she died.
J. de Moei, Joodse kinderen in het kamp Vught (Vught 1999) 24
Hadassa van Cleef died on 11 July 1943 in Westerbork transit camp and she was cremated on 12 July 1943. The urn with her ashes was placed on the Jewish cemetry in Diemen on field U, row 10, grave nr. 9.
Register van joden die in het kamp Westerbork zijn gecremeerd, 1943-1944; archief van de gemeente Westerbork, opgenomen in het archief van de gemeente Midden-Drenthe te Beilen, inv. n 3789