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Letter to Anna Teresa Tymieniecka written 21.03.1969

Letter from Kazimierz Twardowski written 06.02.1923

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

Letter from Stefan Żółkiewski written in 03.01.1968

Letter to Stefan Żółkiewski written in 06.03.1966

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

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

Letter from Irena Sławińska written 1/31/1959

Letter to Kazimierz Twardowski written 09.09.1934

Letter from Kazimierz Ajdukiewicz written 26.02.1961

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