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Letter from Tadeusz Czeżowski written 01.06.1950

Questionnaire of Konstanty Michalski from N/D

Postcard from Tadeusz Kotarbiński written 23.10.1923

Postcard from Stefan Szuman written 12.06.1942

Letter from Jan Patočka written 22.05.1949

Postcard from Kazimierz Ajdukiewicz written 26.11.1922

Letter from Stefan Szuman written nd.06.1942

Letter from Tadeusz Kotarbiński written 04.11.1926

Letter from Stefan Szuman written 18.12.1942

Letter from Stefan Szuman written 29.01.1943

Postcard from Stefan Szuman written 10.02.1943

Letter from Stefan Szuman written 06.10.1942