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Letter from Irena Krońska written in 19.05.1954

Letter to the Polish Academy of Science written 28.04.1964

Letter from Kazimierz Ajdukiewicz written 26.02.1961

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

Letter to Stefan Żółkiewski written in 06.03.1966

Letter from Stefan Żółkiewski written in 12.03.1966

Letter from Kazimierz Ajdukiewicz written 2/26/1961

Letter from Stefan Żółkiewski written in 26.11.1965

Postcard to Kazimierz Twardowski written 21.04.1923

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 03.06.1955

Letter from Irena Sławińska written 31.01.1959