„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, Stanisław Grzegorczyk, Testimony from court/criminal proceedings from 13.09.1948, https://chroniclesofterror.pl/dlibra/show-content?id=4605 [access: 22.06.2026], original: Institute of National Remembrance, GK 179/114.

Institute of National Remembrance, GK 179/114, $citation.Title, accessible: Archive of the Pilecki Institute, Chronicles of Terror.