„Chronicles of Terror”. Base of testimonies of the Witold Pilecki Institute of Solidarity and Valor

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Archive of the Pilecki Institute, Chronicles of Terror, Helena Niechciał, Testimony from court/criminal proceedings from 07.10.1946, https://zapisyterroru.pl/dlibra/show-content?id=3491 [access: 10.06.2026], original: Institute of National Remembrance, GK 196/141.

Institute of National Remembrance, GK 196/141, Files in the criminal case of the former members of the SS crew at Auschwitz-Birkenau concentration camp, accessible: Archive of the Pilecki Institute, Chronicles of Terror.