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Letter to Kazimierz Twardowski written 16.05.1924

Postcard from Kazimierz Ajdukiewicz written 04.08.1925

Letter from Kazimierz Ajdukiewicz written 18.04.1925

Request written 18.06.1921

Letter from Stefan Szuman written 06.10.1942

Letter from Kazimierz Ajdukiewicz written 15.05.1924