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Letter to the Committee of the Library of Classics of Philosophy written 03.03.1954

List of publications written 04.01.1937

Letter to Stefan Żółkiewski written in 06.03.1966

Letter from Roman Suszko written 15.02.1965

Letter to the Committee of the Library of Classics of Philosophy written 14.05.1954

Paper by Janina Makota presented 18.06.1956

Postcard to Kazimierz Twardowski written 21.04.1923

Letter to Kazimierz Twardowski written 09.09.1934

Letter to the Committee of the Library of Classics of Philosophy written 27.04.1954

Letter from Ksawery Piwocki written 11.11.1964

Letter from Stefan Żółkiewski written in 26.11.1965

Letter from Stefan Żółkiewski written in 03.01.1968