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Letter from Kazimierz Ajdukiewicz written 2/26/1961

Letter to Kazimierz Twardowski written 27.01.1923

Letter from Kazimierz Ajdukiewicz written 26.02.1961

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

Letter to Stefan Żółkiewski written in 23.12.1965 (b)

Letter from Stefan Żółkiewski written in 03.01.1968

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

List of publications written 04.01.1937

Letter from Stefan Żółkiewski written in 26.11.1965

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 11.03.1952

Letter from Konstanty Michalski written N/D