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

Letter to Stefan Żółkiewski written in 23.12.1965 (b)

Letter from Kazimierz Ajdukiewicz written 2/26/1961

Letter from Maria Gołaszewska written 22.05.1966

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

Letter from Stefan Żółkiewski written in 12.03.1966

Paper by Janina Makota presented 18.06.1956

Letter from Kazimierz Twardowski written 06.02.1923

Letter from Irena Sławińska written 1/31/1959

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

Letter to Stefan Żółkiewski written in 06.03.1966

Letter from Ksawery Piwocki written 11.11.1964