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Postcard from Stefan Szuman written 19.11.1942

Letter from Stefan Szuman written nd.06.1942

Postcard from Stefan Szuman written 14.01.1943

Letter from Tadeusz Kotarbiński written 06.06.1923

Letter from Kazimierz Ajdukiewicz written 05.04.1918

Letter from Bogdan Suchodolski written in 05.09.1945

Letter from Tadeusz Kotarbiński written 16.04.1923

Postcard from Stefan Szuman written 24.03.1943

Letter from Kazimierz Ajdukiewicz written 01.12.1927

Postcard from Kazimierz Ajdukiewicz written 17.03.1923

Letter from Tadeusz Kotarbiński written 29.09.1926

Letter from Tadeusz Kotarbiński written 18.12.1926