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Letter from Tadeusz Kotarbiński written 06.06.1923

Postcard from Stefan Szuman written 28.05.1942

Postcard from Stefan Szuman written 14.01.1943

Letter from Stefan Szuman written 29.01.1943

Postcard from Tadeusz Kotarbiński written 23.10.1923

Letter from Stefan Szuman written 18.12.1942

Postcard from Kazimierz Ajdukiewicz written 26.11.1922

Letter from Tadeusz Kotarbiński written 14.01.1926

Letter from Bogdan Suchodolski written in 05.09.1945

Letter from Tadeusz Kotarbiński written 04.11.1926

Postcard from Stefan Szuman written 10.02.1943

Letter from Tadeusz Kotarbiński written 29.09.1926