„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, Jan Wiśniewski, Testimony from court/criminal proceedings from 24.06.1967, https://www.zapisyterroru.pl/dlibra/show-content?id=8588 [access: 04.07.2026], original: Institute of National Remembrance, 8/2.

Institute of National Remembrance, 8/2, $citation.Title, accessible: Archive of the Pilecki Institute, Chronicles of Terror.