„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, Jerzy Julian Lang, Testimony from court/criminal proceedings from 27.08.1947, https://www.chroniclesofterror.pl/dlibra/show-content?id=1219 [access: 27.06.2026], original: Institute of National Remembrance, GK 182/154.

Institute of National Remembrance, GK 182/154, Investigation material [OKBZN, District Commission for the Investigation of German Crimes, Warsaw] on Auschwitz concentration camp, accessible: Archive of the Pilecki Institute, Chronicles of Terror.