„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, Konrad Popławski, Testimony from court/criminal proceedings from 09.12.1947, https://www.zapisyterroru.pl/dlibra/show-content?id=8619 [access: 03.07.2026], original: Institute of National Remembrance, 8/1.

Institute of National Remembrance, 8/1, $citation.Title, accessible: Archive of the Pilecki Institute, Chronicles of Terror.