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Letter from Tadeusz Kotarbiński written 18.12.1926

Postcard from Stefan Szuman written 10.02.1943

Postcard from Tadeusz Kotarbiński written 11.08.1923

Letter from Tadeusz Kotarbiński written 14.01.1926

Letter from Tadeusz Kotarbiński written 16.04.1923

Questionnaire of Konstanty Michalski from N/D

Postcard from Stefan Szuman written 12.05.1942

Letter from Tadeusz Kotarbiński written 29.09.1926

Letter from Kazimierz Ajdukiewicz written 01.12.1927

Letter from Jan Patočka written 22.05.1949