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Postcard from Kazimierz Ajdukiewicz written 04.08.1925

Letter from Stefan Szuman written 06.10.1942

Letter from Kazimierz Ajdukiewicz written 15.05.1924

Letter to Kazimierz Twardowski written 16.05.1924

Request written 18.06.1921

Letter from Kazimierz Ajdukiewicz written 18.04.1925