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

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

Letter to the Committee of the Library of Classics of Philosophy written 11.03.1952

Letter from Kazimierz Twardowski written 06.02.1923

Letter from Irena Sławińska written 1/31/1959

Letter to Kazimierz Twardowski written 27.01.1923

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

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

Letter from Stefan Żółkiewski written in 26.11.1965

Letter from Kazimierz Ajdukiewicz written 26.02.1961

Letter from Ksawery Piwocki written 11.11.1964

Letter from Roman Suszko written 15.02.1965