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Letter to Kazimierz Twardowski written 27.01.1923

Letter to Kazimierz Twardowski written 09.09.1934

Letter to the Polish Academy of Science written 28.04.1964

Postcard to Kazimierz Twardowski written 10.08.1937

Paper by Janina Makota presented 18.06.1956

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

Letter to Stefan Żółkiewski written in 23.12.1965 (b)

Letter to Anna Teresa Tymieniecka written 21.03.1969

Letter from Irena Krońska written in 19.05.1954

Letter from Irena Sławińska written 31.01.1959

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

Letter from Irena Sławińska written 1/31/1959