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Letter from Stefan Błachowski written 13.07.1945

Letter from Tadeusz Kotarbiński written 18.12.1926

Letter from Irena Krońska written in 11.11.1965

Letter to the Committee of the Library of Classics of Philosophy written 23.01.1953

Letter from Tadeusz Czeżowski written 17.05.1958

Letter to Kazimierz Ajdukiewicz written 14.04.1949

Letter to the Polish Academy of Science written 11.03.1965

Letter from Kazimierz Twardowski written 17.08.1924

Letter from Stefan Żółkiewski written in 26.11.1965

Postcard from Henryk Elzenberg written 07.05.1964

Letter from Edmund Husserl written 23.12.1928

Letter from Władysław Witwicki written 08.01.1927