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Letter from Władysław Witwicki written 30.09.1923

Letter from Kazimierz Ajdukiewicz written 21.06.1949

Letter from Kazimierz Ajdukiewicz written 24.10.1923

Letter to the Polish Academy of Science written 22.12.1965

Letter from Stefan Żółkiewski written in 13.12.1966

Letter from Konstanty Michalski written 25.02.1938

Postcard from Juliusz Kleiner written 22.08.1948

Letter to the Committee of the Library of Classics of Philosophy written 03.06.1955

Letter to Kazimierz Twardowski written 17.08.1924

Letter from Irena Krońska written in 14.12.1964

Letter from Stanisław Ignacy Witkiewicz written 09.08.1939

Postcard from Kazimierz Ajdukiewicz written 10/10/1948