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Letter from Tadeusz Kotarbiński written 04.11.1926

Letter from Tadeusz Kotarbiński written 29.09.1926

Postcard from Kazimierz Ajdukiewicz written 17.03.1923

Postcard from Tadeusz Kotarbiński written 23.10.1923

Postcard from Stefan Szuman written 12.06.1942

Letter from Kazimierz Ajdukiewicz written 15.05.1924

Letter from Stefan Szuman written 29.01.1943

Postcard from Tadeusz Kotarbiński written 02.05.1923

Letter from Stefan Szuman written 06.10.1942