„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, Wanda Sieradz, Testimony from court/criminal proceedings from 28.02.1991, https://www.zapisyterroru.pl/dlibra/show-content?id=8632 [access: 13.06.2026], original: Institute of National Remembrance in Białystok, Bi 1/1141.

Institute of National Remembrance in Białystok, Bi 1/1141, $citation.Title, accessible: Archive of the Pilecki Institute, Chronicles of Terror.