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Letter from Kazimierz Ajdukiewicz written 15.05.1924

Postcard from Stefan Szuman written 14.01.1943

Letter from Tadeusz Kotarbiński written 18.12.1926

Questionnaire of Konstanty Michalski from N/D

Letter from Tadeusz Czeżowski written 01.06.1950

Letter from Tadeusz Kotarbiński written 16.04.1923

Letter from Jan Patočka written 22.05.1949

Postcard from Stefan Szuman written 22.09.1942

Postcard from Stefan Szuman written 22.07.1942

Letter from Kazimierz Ajdukiewicz written 01.12.1927

Letter from Stefan Szuman written 06.10.1942

Postcard from Kazimierz Ajdukiewicz written 04.08.1925