„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, Rudolf Gamm, Testimony from court/criminal proceedings from 17.09.1947, https://www.zapisyterroru.pl/dlibra/show-content?id=11829 [access: 21.06.2026], original: Institute of National Remembrance, GK 196/216.

Institute of National Remembrance, GK 196/216, $citation.Title, accessible: Archive of the Pilecki Institute, Chronicles of Terror.